PMM-14928 Add FE dependencies and dev workflows to devcontainer

[matejkubinec]

Steps to test out:

PMM_CONTAINER=perconalab/pmm-server:3-dev-latest make env-up

# Installs dependencies
make env-devcontainer

make env-root TARGET=run-ui # make env-root TARGET=run-ui-build

TODO:

1. run-ui doesn't add the moment update the pmm-compat plugin
2. Add make target to run the dev server locally but proxy requests for /pmm-ui from the container (what is currently being done in ui folder)
3. Doesn't handle dashboards/QAN (best to be done after PMM-14837 Migrate grafana-dashboards to the monorepo #5150 is merged)
4. Cache FE dependencies (similar to the go ones)
5. Add target to run unit test/watch tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.71%. Comparing base (2df13a3) to head (01590c5).

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #5155      +/-   ##
==========================================
+ Coverage   47.14%   47.71%   +0.56%     
==========================================
  Files         410      410              
  Lines       41969    41969              
==========================================
+ Hits        19788    20024     +236     
+ Misses      20233    19965     -268     
- Partials     1948     1980      +32     

Flag	Coverage Δ
admin	35.80% <ø> (ø)
agent	53.01% <ø> (+2.29%)	⬆️
managed	47.71% <ø> (+<0.01%)	⬆️
vmproxy	72.09% <ø> (ø)

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.