[MM-53016] Pass timeout to outgoing request to MM server

[hanzei]

Summary

Since v8 model.Client accepts a context.Context(). This PR makes use of the new functionality by passing down the request context, which ensures the request gets cancelled if it times out.

The PR also includes the telemetry fix from mattermost/mattermost-plugin-jira#930.

Ticket Link

https://mattermost.atlassian.net/browse/MM-53016

[codecov-commenter]

Codecov Report

Patch coverage: 6.66% and project coverage change: -0.02% ⚠️

Comparison is base (b235e01) 20.13% compared to head (afac1fe) 20.12%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #476      +/-   ##
==========================================
- Coverage   20.13%   20.12%   -0.02%     
==========================================
  Files          80       80              
  Lines        6605     6609       +4     
==========================================
  Hits         1330     1330              
- Misses       5143     5147       +4     
  Partials      132      132              

Files Changed	Coverage Δ
apps/app.go	0.00% <ø> (ø)
apps/context.go	36.36% <ø> (ø)
apps/expand.go	15.27% <ø> (ø)
server/config/config.go	34.61% <ø> (ø)
server/config/mattermost_config_service.go	0.00% <ø> (ø)
server/config/service.go	0.00% <ø> (ø)
server/config/test_service.go	0.00% <ø> (ø)
server/proxy/bindings.go	32.00% <ø> (ø)
server/proxy/expand_getter.go	0.00% <0.00%> (ø)
server/proxy/install.go	0.00% <ø> (ø)
... and 12 more

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