Update triggers core interceptor to create secret when necessary

[savitaashture]

The core interceptor will create secrets in only 2 cases:

1. when there is no secret present in the cluster.
2. when certificates expire within the existing secret.

If secret exist and have valid certificates no need to recreate secret everytime

Signed-off-by: Savita Ashture sashture@redhat.com

Fixes : https://github.com/tektoncd/triggers/issues/1638

Changes

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• [ ] Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• [ ] Has Tests included if any functionality added or changed
• [ ] Follows the commit message standard
• [ ] Meets the Tekton contributor standards (including functionality, content, code)
• [ ] Has a kind label. You can add one by adding a comment on this PR that contains /kind <type>. Valid types are bug, cleanup, design, documentation, feature, flake, misc, question, tep
• [ ] Release notes block below has been updated with any user facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings). See some examples of good release notes.
• [ ] Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

NONE

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/interceptors/server/server.go	Do not exist	80.6%

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/interceptors/server/server.go	79.7%	80.6%	0.9

[khrm]

/assign @dibyom

/approve

Let's get this merge.

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: khrm

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[dibyom]

/lgtm

[savitaashture]

/cherry-pick release-v0.25.x

[tekton-robot]

@savitaashture: new pull request created: #1673

In response to [this](https://github.com/tektoncd/triggers/pull/1667#issuecomment-1812864656): >/cherry-pick release-v0.25.x 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/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.