feat(chat): fix app icon publishing warning message, add 'save all' option to code editor and 'save' to code editor file context menu, fix code editor empty files content (Issues #2576, #2515, #2427)

[Alexander-Kezik]

Description:

fix app icon publishing warning message
add 'save all' option to code editor and 'save' to code editor file context menu
fix code editor empty files content

Issues:

• Issue [Code app]: File content should be saved by CTRL+s instead of loose focus #2576
• Issue [Code app]: Content can not be added to New files created in code editor #2515
• Issue [Custom app]: Default icons displayed for published custom apps if files for icons was selected from Shared with me or Organization sections which are not available for user #2427

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

[Alexander-Kezik]

/deploy-review

• Deployment failed: failed

[Alexander-Kezik]

/deploy-review

• Deployment failed: failed

[Alexander-Kezik]

/deploy-review

Environment URL: https://chat-ai-dial-chat-pr-2603.nightly-test.deltixhub.io
E2E tests status: success

[IlyaBondar]

/deploy-review

Environment URL: https://chat-ai-dial-chat-pr-2603.nightly-test.deltixhub.io
E2E tests status: success