Update github test release tracker

[marioevz]

🗒️ Description

Generalizes the devnet test-release tracker issue template into a broader Test Release Tracker, and reworks its scope section to mirror the format of our latest hand-written tracker (ethereum#3034).

Changes:

• Renamed .github/ISSUE_TEMPLATE/devnet-tracker.md → test-release-tracker.md; name: is now Test Release Tracker and the template covers any EL test release, not just devnets. Devnet-specific lines and checkboxes are tagged _(devnet only)_ (explained in a top-level tip) so they can be dropped for non-devnet releases.
• Naming: <feat> is now the full release slug written out in full (include -devnet yourself when targeting a devnet), instead of the template appending -devnet. Added slug → tag examples (e.g. glamsterdam-devnet → tests-glamsterdam-devnet@v7.0.0, benchmark → tests-benchmark@v1.0.0).
• New EIPs Included section: a flat, one-line-per-EIP list of commit permalinks to the exact frozen spec version, intended as the source of truth for generating release notes. TBD is allowed for in-flight EIPs, with a closure checkbox enforcing no TBD values remain before the issue is closed.
• New Spec Changes section (replaces the old confidence-grouped scope): a descending bullet hierarchy per EIP, prefixed ✨ New or 🔄 Updated (three-level for updated EIPs: EIP → EIP PR → execution-specs PR; two-level for new EIPs).
• Link policy: EIP links must point at the canonical ethereum/EIPs repo (a PR while in-flight, or a commit permalink once merged) — never an author's fork or eips.ethereum.org.

Template-only change; no spec or test code is affected.

🔗 Related Issues or PRs

N/A.

✅ Checklist

• All: Ran fast static checks to avoid unnecessary CI fails, see also Code Standards and Verifying Changes:

  just static

• All: PR title have the form <type>(<area>):, where <type> and <area> come from an approrpriate C-<type>, respectively A-<area>, label. The title should match the a target squash commit message.
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).
• Tests: For PRs implementing a missed test case, update the post-mortem document to add an entry the list.
• Ported Tests: Add the following docstring to manually enhanced tests from ./tests/ported_static/:

  @manually-enhanced: Do not overwrite. Post-state expectations corrected
  manually (see PR #2784).
  

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