frontend: Allow 5 multitrack reconnect attempts before re-running GCC

[dsaedtler]

Description

Adds a counter to allow up to 5 reconnect failures with the "invalid key" status code before actually giving up.

Motivation and Context

Rather than fully resetting the output, we should try a few more times to wait out any server-side timeouts. If the stream key is still unavailable after 5 attempts (~50 seconds) this will fall back to re-running the full API flow to obtain a new stream key, and possibly different configuration.

How Has This Been Tested?

Locally. Ideally could use a 48 hour test still.

Types of changes

• Tweak (non-breaking change to improve existing functionality)

Checklist:

• My code has been run through clang-format.
• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.

[RytoEX]

There seems to be a stray file here not meant to be included.