in_calyptia_fleet: load configuration on initial startup (backport #10996 to 4.0).

[pwhelan]

Summary

This is a back port of #10996 to the 4.0 stable branch. To avoid slow startups this patch uses a one shot interval to download the initial configuration when registering an agent to a fleet.

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Testing
Before we can approve your change; please submit the following in a comment:

• [N/A] Example configuration file for the change
• Debug log output from testing the change
• Attached Valgrind output that shows no leaks or memory corruption was found

Backporting

• Backport to latest stable release.

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch pwhelan-fleet-load-initial-startup-4.0

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[pwhelan]

This is the debug.log:

debug.log

Here is the valgrind log:

valgrind.log