Fix sync tests when using a token

[JonnyWong16]

Description

Sync tests could fail because of conflicting parallel CI tests using the same token. When a token is created it is associated with a specific X-Plex-Client-Identifier. Using the token with different X-Plex- headers will update the device attributes at https://plex.tv/devices.xml except for the clientIdentifier. This causes issues because one CI could be running main tests which sets the header X-Plex-Provides=controller while another parallel CI running sync test sets the header X-Plex-Provides=sync-target. Depending on which API requests are being made at the time the sync tests could fail because it will suddenly be missing sync-target for the device.

This PR:

• Updates MyPlexPinLogin to use https://plex.tv/api/v2 endpoint.
• Adds helper function createMyPlexDevice that uses MyPlexPinLogin to create a new device on the Plex account.
• Updates sync tests to create a separate sync device with a unique clientIdentifier. This gives the sync tests it's own sync device which won't conflict with the device associated with the token.

See workflow run here: https://github.com/JonnyWong16/python-plexapi/actions/runs/404885213

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the docstring for new or existing methods
• I have added tests when applicable

[codecov-io]

Codecov Report

Merging #620 (2cf0d7e) into master (f22fa56) will decrease coverage by 0.28%.
The diff coverage is 30.23%.

@@            Coverage Diff             @@
##           master     #620      +/-   ##
==========================================
- Coverage   65.86%   65.58%   -0.29%     
==========================================
  Files          20       20              
  Lines        4137     4161      +24     
==========================================
+ Hits         2725     2729       +4     
- Misses       1412     1432      +20     

Impacted Files	Coverage Δ
plexapi/myplex.py	29.52% <25.00%> (-0.50%)	⬇️
plexapi/base.py	83.89% <100.00%> (ø)
plexapi/library.py	78.82% <100.00%> (ø)
plexapi/utils.py	94.90% <100.00%> (ø)

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[Hellowlol]

Thanks! Should the test run a claimed server or am it missing something?

[jjlawren]

Thanks! Should the test run a claimed server or am it missing something?

Yes, a claimed server with an account that also has a valid Plex Pass.