30658 Add gunicorn post fork hook to re-initialize LD client

[argush3]

Issue #: /bcgov/entity#30658

Description of changes:

• Add gunicorn post fork hook to re-init LD client so FF value updates and flag evaluations are updated between LD client & server in real-time. Note this is how LD official documentation recommends dealing with this issue if you use gunicorn with the --preload flag.
• Add gunicron exit work hook to flush any buffered LD events
• Fix typo for worker connections

Local testing results

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