[FC-384] Add sysadmin to oauth flow and change the admin_path

[mzaniolo]

Closes: FC-384

[codecov]

Codecov Report

❌ Patch coverage is 93.18182% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.69%. Comparing base (8ad0e2a) to head (cd0d671).

Files with missing lines	Patch %	Lines
tests/server.py	70.00%	2 Missing and 1 partial ⚠️
tests/synapse_clock.py	60.00%	2 Missing ⚠️
tests/unittest.py	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #82      +/-   ##
==========================================
+ Coverage   83.08%   83.69%   +0.60%     
==========================================
  Files          18       19       +1     
  Lines        1874     1950      +76     
  Branches      193      198       +5     
==========================================
+ Hits         1557     1632      +75     
- Misses        234      235       +1     
  Partials       83       83              

Files with missing lines	Coverage Δ
synapse_token_authenticator/config.py	70.40% <100.00%> (+1.59%)	⬆️
synapse_token_authenticator/token_authenticator.py	72.72% <100.00%> (+1.26%)	⬆️
tests/__init__.py	89.56% <100.00%> (ø)
tests/test_oauth.py	100.00% <100.00%> (ø)
tests/unittest.py	86.14% <83.33%> (-0.28%)	⬇️
tests/synapse_clock.py	60.00% <60.00%> (ø)
tests/server.py	77.77% <70.00%> (-0.89%)	⬇️

... and 1 file with indirect coverage changes

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