[upstream] Standalone console improvements

[jotak]

• Handle page reload / routed from url with react-router
• Handle proxying to configured rules/alerts urls (in plugin, it uses the openshift console endpoints)

[openshift-ci]

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[jotak]

fyi @npinaeva I'm doing some small improvements to raise the UX on the standalone console

[codecov]

Codecov Report

❌ Patch coverage is 0% with 49 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.42%. Comparing base (0d5a261) to head (48f9e96).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/handler/promproxy.go	0.00%	35 Missing ⚠️
pkg/server/routes.go	0.00%	4 Missing and 3 partials ⚠️
pkg/prometheus/client.go	0.00%	6 Missing ⚠️
pkg/config/config.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1173      +/-   ##
==========================================
- Coverage   53.64%   53.42%   -0.22%     
==========================================
  Files         205      206       +1     
  Lines       10545    10588      +43     
  Branches     1309     1309              
==========================================
  Hits         5657     5657              
- Misses       4371     4412      +41     
- Partials      517      519       +2     

Flag	Coverage Δ
uitests	55.94% <ø> (ø)
unittests	46.65% <0.00%> (-0.72%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
pkg/config/config.go	47.32% <0.00%> (ø)
pkg/prometheus/client.go	0.00% <0.00%> (ø)
pkg/server/routes.go	51.61% <0.00%> (-5.53%)	⬇️
pkg/handler/promproxy.go	0.00% <0.00%> (ø)

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