PMM-10078 Extract portal client, add dev env variables for portal address overwriting

[artemgavrilov]

PMM-10078

Build: SUBMODULES-2546

• [ ] https://github.com/percona-platform/grafana/pull/436
• [ ] https://github.com/percona-platform/infra/pull/280
• [ ] https://github.com/percona/pmm-ui-tests/pull/309

[codecov[bot]]

Codecov Report

Merging #1136 (ea557fa) into main (ec60eb4) will decrease coverage by 0.07%. The diff coverage is 37.51%.

@@            Coverage Diff             @@
##             main    #1136      +/-   ##
==========================================
- Coverage   49.29%   49.21%   -0.08%     
==========================================
  Files         180      181       +1     
  Lines       20826    21390     +564     
==========================================
+ Hits        10267    10528     +261     
- Misses       9426     9689     +263     
- Partials     1133     1173      +40     

Flag	Coverage Δ
all	48.87% <37.51%> (-0.08%)	:arrow_down:
cover	49.25% <39.66%> (-0.15%)	:arrow_down:
crosscover	49.21% <37.51%> (-0.08%)	:arrow_down:
update	12.84% <29.11%> (+0.21%)	:arrow_up:

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

Impacted Files	Coverage Δ
cmd/pmm-managed-starlark/main.go	0.00% <0.00%> (ø)
main.go	0.00% <0.00%> (ø)
models/database.go	49.61% <0.00%> (ø)
models/node_helpers.go	71.08% <ø> (ø)
models/settings.go	100.00% <ø> (ø)
services/agents/handler.go	0.00% <0.00%> (ø)
services/agents/state.go	0.00% <0.00%> (ø)
services/alertmanager/alertmanager.go	53.92% <ø> (ø)
services/config/config.go	0.00% <ø> (ø)
services/grafana/auth_server.go	59.18% <ø> (ø)
... and 45 more

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