fix: Update workflows to work on the release-ulmo branch.

[dianakhuang]

Removes several workflows and then updates the existing workflows to work against the release branch instead of master.

[Copilot]

Pull Request Overview

This PR updates GitHub workflow configurations to target the release-ulmo branch instead of master as part of a branch migration strategy. The changes also remove some organization-level workflow dependencies to streamline the CI/CD pipeline.

• Updates all workflow branch triggers from master to release-ulmo
• Removes two workflows that depend on organization-level shared workflows
• Updates default branch references in workflow dispatch inputs

Reviewed Changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
.github/workflows/verify-dunder-init.yml	Updated pull request trigger branch from master to release-ulmo
.github/workflows/upgrade-python-requirements.yml	Changed default target branch for manual workflow dispatch
.github/workflows/upgrade-one-python-dependency.yml	Updated default branch for dependency upgrade workflow
.github/workflows/units-test-scripts-user-retirement.yml	Updated push trigger branch reference
.github/workflows/units-test-scripts-structures-pruning.yml	Updated push trigger branch reference
.github/workflows/unit-tests.yml	Updated push trigger branch reference
.github/workflows/static-assets-check.yml	Updated push trigger branch reference
.github/workflows/shellcheck.yml	Updated push trigger branch reference
.github/workflows/semgrep.yml	Updated push trigger branch reference
.github/workflows/quality-checks.yml	Removed old release branch and updated to release-ulmo
.github/workflows/migrations-check.yml	Updated push trigger branch reference
.github/workflows/lockfileversion-check.yml	Updated push trigger branch reference
.github/workflows/lint-imports.yml	Updated push trigger branch reference
.github/workflows/js-tests.yml	Updated push trigger branch reference
.github/workflows/add-remove-label-on-comment.yml	Removed entire workflow file
.github/workflows/add-depr-ticket-to-depr-board.yml	Removed entire workflow file

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