Update issue templates and labeler for v2.6 release

[Borda]

What does this PR do?

• Add ver: 2.6.x label and keys to advanced-issue-labeler.yml
• Remap master branch label to ver: 2.7.x
• Add v2.6 option to bug report version dropdown
• Update environment template example version to 2.6.0

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• Did you make sure to update the documentation with your changes? (if necessary)
• Did you write any new necessary tests? (not for typos and docs)
• Did you verify new and existing tests pass locally with your changes?
• Did you list all the breaking changes introduced by this pull request?
• Did you update the CHANGELOG? (not for typos, docs, test updates, or minor internal changes/refactors)

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📚 Documentation preview 📚: https://pytorch-lightning--21598.org.readthedocs.build/en/21598/

[github-actions]

⚡ Required checks status: All passing 🟢

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[Copilot]

Pull request overview

Updates GitHub repo hygiene and issue triage automation to reflect the v2.6 release line by expanding the version options and updating the version-label mapping.

Changes:

• Add ver: 2.6.x mapping to the advanced issue labeler and remap the master key to ver: 2.7.x.
• Add v2.6 to the bug report “version” dropdown and update the environment example to 2.6.0.
• Ignore *.local.md files via .gitignore.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
.gitignore	Ignores local-only markdown files (*.local.md).
.github/advanced-issue-labeler.yml	Adds ver: 2.6.x keys and maps master to ver: 2.7.x.
.github/ISSUE_TEMPLATE/1_bug_report.yaml	Adds v2.6 to version dropdown and updates environment version example to 2.6.0.

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