Fix GetVersionNumber always computing v3.0.0-rc.1 by preventing duplicate release branch config

[Copilot]

The shared essentialsplugins-getversion.yml template unconditionally replaces replace-me-feature-branch/replace-me-prerelease placeholders in .releaserc.json for every non-main branch. On the release branch this injected a second "name": "release" entry alongside the hardcoded one, leaving semantic-release unable to identify v3.0.0-rc.1 as the prior rc release — so it recomputed v3.0.0-rc.1 every run and failed with fatal: tag 'v3.0.0-rc.1' already exists.

Changes

• Inline getVersion job — replaces the reusable uses: …/essentialsplugins-getversion.yml@main call with the equivalent inline steps, giving this repo control over the substitution guards.
• Guard placeholder replacement steps — both Replace branch name and Replace prerelease name steps now skip for release and development in addition to main, preventing the duplicate branch entry:

# before (shared template)
if: steps.get_branch.outputs.branch != 'main'

# after (inline, this repo)
if: |
  steps.get_branch.outputs.branch != 'main' &&
  steps.get_branch.outputs.branch != 'release' &&
  steps.get_branch.outputs.branch != 'development'

With the duplicate removed, semantic-release finds v3.0.0-rc.1 as the last rc release and correctly increments to v3.0.0-rc.2 on the next commit.

• Preserve runTests dependency — the runTests → getVersion → build-4Series job chain is maintained to match the current release branch structure.
• Pin gha-find-replace to @v3 instead of @master.