PM-4393: Link project access support email

[jmgasper]

What was broken
Unauthorized Work project access messages displayed support@topcoder.com as plain text, so users could not click it to contact support.

Root cause
The shared Work ErrorMessage component rendered message text as plain content and did not link the support email used by PM-4393 denial copy.

What was changed
Updated ErrorMessage to convert support@topcoder.com in plain text messages into a standard mailto:support@topcoder.com link while preserving the existing message text and styling. Updated ProjectRouteAccessGuard expectations for the split text/link rendering.

Any added/updated tests
Added ErrorMessage coverage for the mailto support link and updated ProjectRouteAccessGuard denial tests to assert the support link href.

Validation run:

• yarn test:no-watch src/apps/work/src/lib/components/ErrorMessage/ErrorMessage.spec.tsx src/apps/work/src/lib/components/ProjectRouteAccessGuard/ProjectRouteAccessGuard.spec.tsx src/apps/work/src/pages/challenges/ChallengesListPage/ChallengesListPage.spec.tsx src/apps/work/src/pages/challenges/ChallengeEditorPage/ChallengeEditorPage.spec.tsx
• yarn lint
• yarn run build
• yarn test:no-watch --silent still fails in existing unrelated PaymentView and ChallengeEditorForm specs on current dev.