[Backport - 2.8] Change Auth Token Env Var Name #9687

[BOsterbuhr]

Use DEX_TOKEN instead of PACH_ID_TOKEN

[acohen4]

LGTM

[codecov]

Codecov Report

Attention: 370 lines in your changes are missing coverage. Please review.

Comparison is base (6f11273) 49.91% compared to head (58f7741) 49.70%.
Report is 29 commits behind head on 2.8.x.

Files	Patch %	Lines
...c/internal/clusterstate/migrationutils/sanitize.go	33.83%	128 Missing and 3 partials ⚠️
src/server/pps/server/determined.go	9.25%	98 Missing ⚠️
src/internal/clusterstate/v2.8.0/pfsdb.go	61.03%	14 Missing and 16 partials ⚠️
src/internal/pfsdb/commits.go	70.29%	21 Missing and 9 partials ⚠️
src/server/pfs/server/driver.go	65.15%	16 Missing and 7 partials ⚠️
src/internal/pfsdb/repos.go	72.22%	10 Missing and 5 partials ⚠️
src/internal/pfsdb/branches.go	85.07%	6 Missing and 4 partials ⚠️
...internal/clusterstate/migrationutils/pg_batcher.go	68.96%	5 Missing and 4 partials ⚠️
src/server/pfs/cmds/cmds.go	46.66%	8 Missing ⚠️
src/server/pps/server/api_server.go	0.00%	5 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##            2.8.x    #9693      +/-   ##
==========================================
- Coverage   49.91%   49.70%   -0.21%     
==========================================
  Files         565      565              
  Lines       68953    69252     +299     
==========================================
+ Hits        34417    34425       +8     
- Misses      31078    31362     +284     
- Partials     3458     3465       +7     

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