Backport CORE-1123 to Pachyderm 2.3

[FahadBSyed]

Description

This PR backports a feature to 2.3 which allows a user to configure lokiHost and lokiPort in pachyderm directly. This allows them to use a loki instance in another namespace. The existing lokiDeploy flag sets the above variables using variable substitutions to point to the pachyderm-loki service that is created by default.

[codecov]

Codecov Report

Merging #8283 (fb63a5d) into 2.3.x (e5cf0fe) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##            2.3.x    #8283      +/-   ##
==========================================
- Coverage   22.30%   22.25%   -0.06%     
==========================================
  Files         415      415              
  Lines      112266   112266              
==========================================
- Hits        25044    24987      -57     
- Misses      82952    82981      +29     
- Partials     4270     4298      +28     

Impacted Files	Coverage Δ
src/internal/serviceenv/config.go	38.09% <ø> (ø)
src/internal/serviceenv/service_env.go	55.69% <0.00%> (ø)
src/server/debug/server/server.go	4.40% <0.00%> (ø)
src/server/pps/server/worker_rc.go	0.45% <0.00%> (ø)
src/internal/storage/track/gc.go	74.41% <0.00%> (-9.31%)	⬇️
src/internal/storage/chunk/chain.go	87.09% <0.00%> (-6.46%)	⬇️
src/server/pfs/server/val_server.go	48.21% <0.00%> (-5.36%)	⬇️
src/internal/storage/fileset/compaction.go	72.34% <0.00%> (-4.26%)	⬇️
src/server/pfs/server/trigger.go	73.21% <0.00%> (-3.58%)	⬇️
src/internal/storage/chunk/uploader.go	86.20% <0.00%> (-3.45%)	⬇️
... and 16 more

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