feat(gitcommit): support age filtering - #10240

Add age filtering to git commit plugin
Similar to the other plugins that already support cooldown.

Here is an example of manifest

sources:
  from-scm-with-age:
    name: Get the latest commit settled for at least one hour from an SCM working directory
    kind: gitcommit
    scmid: git-repository
    spec:
      branch: main
      age:
        minimum: "1h"

Test

To test this pull request, you can run the following commands:

cd pkg/plugins/resources/gitcommit
go test
cd  pkg/plugins/utils/gitgeneric
go test

Additional Information

Checklist

• I have updated the documentation via pull request in website repository.
• I have tested this pull request manually with a custom Updatecli build and it works as expected.

Tradeoff

Potential improvement