fix: extract mcvs-golang-action version from trailing comment

[sbp-bvanb]

When the action is pinned to a commit sha, the readable version lives in the trailing comment:

uses: 9be40cef... # v3.12.1

yq strips that comment when selecting the uses scalar, so the sync check compared the sha against REMOTE_URL_REF and always reported a mismatch. Read the version from line_comment first and fall back to the ref after @ when the action is not sha pinned.

[ergousha]

Although we do not use such versioning in this repo given below, in order to comply with standard approach, consider the comment below. By this way, this block will be re-usable without hassle.

The regex ^[[:space:]](v?[0-9]+(.[0-9]+))[[:space:]]*$ strictly matches numeric version structures (e.g., v1, v1.2.3). If a pre-release or release-candidate version tag is used (e.g., v3.12.1-rc.1, v3.12.1-beta.2), the regex will reject the line comment and trigger the fallback to the commit SHA, reporting a false-positive mismatch.

Suggested Refinement:

Supports versions like v1.2.3, 1.2.3-rc.1, v2.0.0-beta+exp.sha.5114f85

expected_mcvs_golang_action_version=$(yq "${mcvs_golang_action_uses} | line_comment" .github/workflows/golang.yml | sed -nE 's/^[[:space:]](v?[0-9]+(.[0-9]+)(-[0-9A-Za-z.-]+)?(+[0-9A-Za-z.-]+)?)[[:space:]]*$/\1/p')