Migrate workflows + templates to ITensorActions v2

[mtfishman]

Summary

Migrates this repo's own workflow callers AND the workflow templates to the renamed shape from ITensorActions v2.0.0. Two parallel sets of changes (in .github/workflows/ and template/.github/workflows/) kept in sync per CLAUDE.md convention.

What changes

For each of the 12 standard workflow files (caller copy + template copy):

• Workflow name: matches the file's basename (e.g. FormatCheck.yml → name: "FormatCheck"). Drops cases like "Format Check", "Integration Test Request", "Register Package".
• Job display name: also matches the filename for single-job workflows.
• Job key is kebab-case lowercase, with brand names like tagbot/compathelper treated as single words rather than split on internal capitals (Register → registrator, compat-helper → compathelper, etc.).
• uses: ITensor/ITensorActions/.github/workflows/X.yml@v1 → @v2.
• FormatCheckComment.yml workflow_run.workflows: trigger updated from ["Format Check"] to ["FormatCheck"] to match the renamed parse-phase workflow.

The end-state of the templates matches what SparseArraysBase.jl's main already carries (verified live in ITensor/SparseArraysBase.jl#177 — every required-context check from the new v2 ruleset reported under its new name and SUCCESS).

Patch version bumped to 0.3.59.

Rollout follow-up

Once this lands, the next step is the ITensorOrgPatches sweep that copies these templates into the rest of the standard repo set, and the matching ruleset updates (replacing old context names with new ones in each repo's branch ruleset).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.34%. Comparing base (e1aa975) to head (8e4b562).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #137   +/-   ##
=======================================
  Coverage   87.34%   87.34%           
=======================================
  Files           1        1           
  Lines         158      158           
=======================================
  Hits          138      138           
  Misses         20       20           

Flag	Coverage Δ
docs	60.13% <ø> (ø)

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