useSubmit() should function after reconnect

[compulim]

Fixes #4706.

Changelog Entry

Fixed

• Fixes #4706. Send button and ENTER key should function after reconnected, by @compulim, in PR #4707.

Description

When DLASE reconnect, ConnectionStatus.Connecting and ConnectionStatus.Online is observed again. This triggered DIRECT_LINE/RECONNECT_* actions.

After reconnected, the useConnectivityStatus() hook returns ["reconnected"], instead of ["connected"].

However, in our useSubmit() hook, we only cater "connected" but not "reconnected". That means, reconnected is more-or-less same as disconnected.

That means, when clicking on send button or ENTER key, it is not functional because useSubmit() think it is offline.

We checked other source code, and no other similar issues were discovered.

Although useSubmit() disable text box submission when offline, other hooks (e.g. useSendPostBack, useSendEvent, etc.) does not look at online status.

We should revisit the whole scenario again:

• When offline, post activity should be disabled for all hooks, including post back and other activities, or;
• Regardless online or offline, post activity should be allowed

Specific Changes

• useSubmit() to consider both "connected" and "reconnected" cases as connected
• Added tests

• I have added tests and executed them locally
• I have updated CHANGELOG.md
• I have updated documentation

Review Checklist

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• Accessibility reviewed (tab order, content readability, alt text, color contrast)
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• Documents reviewed (docs, samples, live demo)
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• package.json and package-lock.json reviewed
• Security reviewed (no data URIs, check for nonce leak)
• Tests reviewed (coverage, legitimacy)