feat: add a file watcher for Azure client cert auth

[bryan-cox]

What type of PR is this? /kind bug

What this PR does / why we need it: Add a file watcher, utilizing fsnotify, to monitor the Azure client certificate authentication. If the file changes, the pod will need to be restarted since Azure SDK doesn't support hotloading a new certificate yet.

Which issue(s) this PR fixes:

Fixes #

Requirements:

• [ ] uses conventional commit messages
• [ ] includes documentation
• [ ] adds unit tests
• [ ] tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: bryan-cox Once this PR has been reviewed and has the lgtm label, please assign edreed for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files: - **[OWNERS](https://github.com/kubernetes-sigs/azuredisk-csi-driver/blob/master/OWNERS)** Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[k8s-ci-robot]

Welcome @bryan-cox!

It looks like this is your first PR to kubernetes-sigs/azuredisk-csi-driver 🎉. Please refer to our pull request process documentation to help your PR have a smooth ride to approval.

You will be prompted by a bot to use commands during the review process. Do not be afraid to follow the prompts! It is okay to experiment. Here is the bot commands documentation.

You can also check if kubernetes-sigs/azuredisk-csi-driver has its own contribution guidelines.

You may want to refer to our testing guide if you run into trouble with your tests not passing.

If you are having difficulty getting your pull request seen, please follow the recommended escalation practices. Also, for tips and tricks in the contribution process you may want to read the Kubernetes contributor cheat sheet. We want to make sure your contribution gets all the attention it needs!

Thank you, and welcome to Kubernetes. :smiley:

[k8s-ci-robot]

Hi @bryan-cox. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[bryan-cox]

/retest

[bryan-cox]

/retest

[bryan-cox]

/retest-required

[bryan-cox]

@andyzhangx are the tests failing legitimately or is something else wrong? The errors don't appear to be related to the PR but I could be missing something 🤔

[bryan-cox]

/test pull-azuredisk-csi-driver-external-e2e-single-az

[bryan-cox]

/retest-required

[bryan-cox]

/retest-require

[andyzhangx]

/retest

[k8s-ci-robot]

@bryan-cox: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-azuredisk-csi-driver-external-e2e-single-az	e5a417b60eb756d7a3c241fcdb5aea02d57fcfe8	link	true	/test pull-azuredisk-csi-driver-external-e2e-single-az
pull-azuredisk-csi-driver-e2e-capz-windows-2022-hostprocess	e5a417b60eb756d7a3c241fcdb5aea02d57fcfe8	link	true	/test pull-azuredisk-csi-driver-e2e-capz-windows-2022-hostprocess

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository. I understand the commands that are listed [here](https://go.k8s.io/bot-commands).

[andyzhangx]

/cherrypick release-1.31

[k8s-infra-cherrypick-robot]

@andyzhangx: new pull request created: #2629

In response to [this](https://github.com/kubernetes-sigs/azuredisk-csi-driver/pull/2619#issuecomment-2475221830): >/cherrypick release-1.31 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.