adobe / spectrum-web-components / 34252229720

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feat(release): fully independent pipelines release pattern (#6638)

* ci(release): split gen1/gen2 release pipelines with a Version PR flow (#6607)

* ci(release): split gen1/gen2 changesets and publish workflows

Splits the shared publish pipeline into independent gen1 (main -> next/latest)
and gen2 (gen2-beta -> beta, pre-release mode) release streams per SWC-2315,
each with its own changeset folder so a version bump for one generation no
longer forces a decision about the other.

Introduces a fine-grained bot PAT (RELEASE_BOT_TOKEN, to be added as a repo
secret + branch-protection bypass actor) for the version-bump push, replacing
the default GITHUB_TOKEN. Adds a release-branch-lock composite action that
temporarily blocks PR merges to the target branch for the duration of a real
release run, closing the window where a concurrent merge could land between
this job's checkout and its final push-back.

* ci(release): fully separate changesets per generation

Moves from a root-level .changeset + .changeset-2nd-gen split (which needed
a copy-into-.changeset shim at release time, since @changesets/cli only ever
reads .changeset/ relative to wherever it's invoked) to two genuinely
independent changesets instances: 1st-gen/.changeset/ and 2nd-gen/.changeset/,
each with its own config.json, README, and now its own @changesets/cli
devDependency so `yarn changeset` resolves correctly from within either
directory. Removes the runtime copy-in/copy-out step from publish-2nd-gen.yml
entirely - it's no longer needed.

Also fixes every other repo-root reference to the old single .changeset/
path that would have silently broken or degraded (lint-staged, the 1st-gen
changelog/test-changed scripts, the CircleCI docs-only-change filter, and two
doc links), since 1st-gen's own nested `workspaces` field means changesets
invoked there can no longer see out-of-scope packages by design - those
ignore/fixed entries are dropped as dead weight rather than kept as unusable
safe... (continued)

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