Hide "Shared by link" when sharing by link is disabled

[pboguslawski]

• Resolves: [Bug]: "Shared by link" displayed when sharing by link is disabled #50323

Summary

Related: #50323
Author-Change-Id: IB#1156670

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI

[pboguslawski]

Switched to exisitng capability.

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[susnux]

Please adjust the code to comply with ESLint:

/home/runner/actions-runner/_work/server/server/build/frontend-legacy/apps/files_sharing/src/files_views/shares.ts
Error: 18:1 error Expected "@nextcloud/capabilities" (external) to come before "../services/SharingService.ts" (unknown) perfectionist/sort-imports

easiest: npm run lint:fix

[susnux]

Also those tests are related and needs to be adjusted:

FAIL nextcloud-ui-legacy apps/files_sharing/src/files_views/shares.spec.ts > Sharing views definition > Shared with others view is not registered if user has no storage quota
TypeError: Cannot read properties of undefined (reading 'public')
❯ apps/files_sharing/src/files_views/shares.ts:85:24
83|
84| // Don't show this view if sharing by link is disabled.
85| if (getCapabilities().files_sharing.public.enabled) {
| ^
86| Navigation.register(new View({
87| id: sharingByLinksViewId,
❯ apps/files_sharing/src/files_views/shares.spec.ts:79:3

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[2/3]⎯

FAIL nextcloud-ui-legacy apps/files_sharing/src/files_views/shares.spec.ts > Sharing views contents > Sharing overview get contents
TypeError: Cannot read properties of undefined (reading 'public')
❯ apps/files_sharing/src/files_views/shares.ts:85:24
83|
84| // Don't show this view if sharing by link is disabled.
85| if (getCapabilities().files_sharing.public.enabled) {
| ^
86| Navigation.register(new View({
87| id: sharingByLinksViewId,
❯ apps/files_sharing/src/files_views/shares.spec.ts:113:3