Add version flag to ecr-credential-provider

[cartermckinnon]

What type of PR is this?

/kind feature

What this PR does / why we need it:

The ecr-credential-provider has recently changed the API version it supports (#597). Currently, there is no straightforward way to distinguish two ecr-credential-provider binaries, which makes changes like #597 difficult to handle. This PR adds a --version flag that returns the standard gitVersion as in k8s.io/component-base/version, to help in such situations.

Special notes for your reviewer:

I ran go mod vendor, which did...a lot of things. Should I back those changes out? Removed.

Does this PR introduce a user-facing change?:

Yes.

A `--version` flag has been added to the `ecr-credential-provider`.

[k8s-ci-robot]

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[k8s-ci-robot]

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[dims]

@cartermckinnon love the idea. please drop the vendor/ directory?

[dims]

/ok-to-test

can you please paste output of both ecr-credential-provider and ecr-credential-provider --version so we can see how it looks?

[cartermckinnon]

Example output:

> ecr-credential-provider --help
ECR credential provider for kubelet

Usage:
  ecr-credential-provider [flags]

Flags:
  -h, --help      help for ecr-credential-provider
  -v, --version   version for ecr-credential-provider

> ecr-credential-provider --version
ecr-credential-provider version v1.27.1-8-gb80e8ef-dirty

[dims]

/approve

thanks @cartermckinnon

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dims

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[dims]

/lgtm