Reload ZHA only a single time when the connection is lost multiple times

[puddly]

Proposed change

When the host abruptly stops communicating with an EmberZNet radio (i.e. the event loop is blocked), the firmware will retry sending the RSTACK packet many times. Each one generates a connection_lost event when it is finally processed, which results in in every single one of these events backgrounding a ZHA reload. This causes the integration to erroneously reload many more times than necessary to re-establish a connection.

This PR ensures only a single reload at a time can occur.

Note that this change will not fix the problem causing these resets.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue:
• This PR is related to issue: Zigbee is failing constantly, requires reloading/reinitialization #105506, [ZHA] Integration randomly stops working, sits in 'initialising' state. (still) #107490
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.

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• Documentation added/updated for www.home-assistant.io

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[home-assistant]

Hey there @dmulcahey, @Adminiuga, @TheJulianJES, mind taking a look at this pull request as it has been labeled with an integration (zha) you are listed as a code owner for? Thanks!

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[dmulcahey]

LGTM