fix(chat): Application attachments (Issues #2015, #2018, #2019, #2024)

[Derikyan]

Description:

1. Attach file icon should not be shown for chat creation if selected custom application has 'Max attachments'=0
2. File extentions configured in app's settings should be displayed in Attach files modal form
3. Format of file types should be validated for field Attachment types
4. Incorrect small size of app icon on review form for publication request for application

Issues:

• Issue [App Publication]: Attach file icon should not be shown for chat creation if selected custom application has 'Max attachments'=0 #2015
• Issue [Custom application]: file extentions configured in app's settings should be displayed in Attach files modal form #2018
• Issue [Custom application]: Format of file types should be validated for field Attachment types #2019
• Issue [Custom app][Admin view]: Incorrect small size of app icon on review form for publication request for application #2024

UI changes

Checklist:

• the pull request name complies with Conventional Commits
• the pull request name starts with fix(<scope>):, feat(<scope>):, feature(<scope>):, chore(<scope>):, hotfix(<scope>): or e2e(<scope>):. If contains breaking changes then the pull request name must start with fix(<scope>)!:, feat(<scope>)!:, feature(<scope>)!:, chore(<scope>)!:, hotfix(<scope>)!: or e2e(<scope>)!: where <scope> is name of affected project: chat, chat-e2e, overlay, shared, sandbox-overlay, etc.
• the pull request name ends with (Issue #<TICKET_ID>) (comma-separated list of issues)
• I confirm that do not share any confidential information like API keys or any other secrets and private URLs

[Derikyan]

/deploy-review

Environment URL: https://chat-ai-dial-chat-pr-2051.nightly-test.deltixhub.io
E2E tests status: success

[Derikyan]

/deploy-review

Environment URL: https://chat-ai-dial-chat-pr-2051.nightly-test.deltixhub.io
E2E tests status: success

[Derikyan]

/deploy-review

Environment URL: https://chat-ai-dial-chat-pr-2051.nightly-test.deltixhub.io
E2E tests status: failed

[Derikyan]

/deploy-review

Environment URL: https://chat-ai-dial-chat-pr-2051.nightly-test.deltixhub.io
E2E tests status: success