Checking PR #29898: modemmanager: choose plugins for build (Formalities Audit)

✅ Pull request originates from a dedicated feature branch (pr/plugins_mm)

Commit 3074589 - modemmanager: make building builtin options optional:

✅ Author and committer identities are valid
✅ Commit is not a merge commit
✅ Commit subject layout and length are valid: "modemmanager: make building builtin options optional"
✅ Commit description lines adhere to width formatting rules
✅ Commit contains a consistent and valid 'Signed-off-by:' line
⚠️ Warning: No reference link (e.g., upstream release notes, changelog, or history URL) detected in description.
⚠️ Warning: Commit is unsigned or cryptographic signature verification failed (Reason: unsigned). Signing commits is a recommended best practice for verifying identity, but is not mandatory.

Commit 770ed09 - modemmanager: add configurable plugins:

✅ Author and committer identities are valid
✅ Commit is not a merge commit
✅ Commit subject layout and length are valid: "modemmanager: add configurable plugins"
✅ Commit description lines adhere to width formatting rules
✅ Commit contains a consistent and valid 'Signed-off-by:' line
⚠️ Warning: No reference link (e.g., upstream release notes, changelog, or history URL) detected in description.
⚠️ Warning: Commit is unsigned or cryptographic signature verification failed (Reason: unsigned). Signing commits is a recommended best practice for verifying identity, but is not mandatory.

Commit d193572 - modemmanager: bump PKG_RELEASE:

✅ Author and committer identities are valid
✅ Commit is not a merge commit
✅ Commit subject layout and length are valid: "modemmanager: bump PKG_RELEASE"
✅ Commit description lines adhere to width formatting rules
✅ Commit contains a consistent and valid 'Signed-off-by:' line
⚠️ Warning: No reference link (e.g., upstream release notes, changelog, or history URL) detected in description.
⚠️ Warning: Commit is unsigned or cryptographic signature verification failed (Reason: unsigned). Signing commits is a recommended best practice for verifying identity, but is not mandatory.