[KoushikSagarr]

What github issue is this PR for, if any?

Resolves [#7303]

What changed, and why?

• Deleted the obsolete app/javascript/src/all_casa_admin/tables.js DataTables initialization.
• Deleted the now-unused shared app/javascript/datatable.js helper.
• Removed the obsolete require('./src/all_casa_admin/tables') entry from app/javascript/all_casa_admin.js.
• Removed the unused import './datatable.js' entry from app/javascript/application.js.
• Confirmed that the legacy table.admin-list and table.organization-list selectors are no longer referenced by application views, templates, or helpers.
• Kept changes strictly limited to the obsolete All-CASA-admin DataTables scripts and their application entry points. The datatables.net-dt dependency remains untouched as requested.

This is another small, independently reviewable contribution toward removing obsolete JavaScript code from CASA.

How is this tested? (please write rspec and jest tests!) 💖💪

• Jest: 15 test suites passed, 124 tests passed, 0 failures.
• Asset build: npm run build && npm run build:css completed successfully with 0 errors and 0 warnings.
• RSpec: spec/system/all_casa_admins — 19 examples, 0 failures.
• Reference verification: Confirmed that initializeDataTable, table.admin-list, and table.organization-list have no remaining application references.
• Dependency verification: Confirmed datatables.net-dt remains unchanged in package.json, package-lock.json, and app/javascript/application.js.
• Git diff: git diff --check passed with no whitespace errors.

Screenshots please :)

Not applicable — this PR removes obsolete JavaScript initialization without introducing UI changes.

Feelings gif (optional)

Another cleanup PR in the books. Less legacy JavaScript, cleaner CASA! 💪