enhance(qrm): mem bandwidth throttler qrm plugin supports multiple resctrl groups sharing same priority

[h-w-chen]

What type of PR is this?

Enhancements

What this PR does / why we need it:

traditional mem bandwidth policy is able to throttle fixed resctrl groups with unique priorities. DB-UCE colocation scenario has dedicated (one of the fixed groups) and machine (not part of fixed groups), both with same priority. This PR adapts to allow extra resctrl groups and multiple groups sharing identical priority.

Special notes for your reviewer:

code has been verified on single node at test cluster

[codecov]

Codecov Report

❌ Patch coverage is 74.22222% with 58 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.57%. Comparing base (0c304b9) to head (b31c94e).
⚠️ Report is 29 commits behind head on main.

Files with missing lines	Patch %	Lines
...nt/qrm-plugins/mb/advisor/uniq_priority_advisor.go	56.86%	15 Missing and 7 partials ⚠️
...g/agent/qrm-plugins/mb/advisor/priority_advisor.go	58.69%	17 Missing and 2 partials ⚠️
.../qrm-plugins/mb/advisor/priority/group_priority.go	79.48%	5 Missing and 3 partials ⚠️
pkg/agent/qrm-plugins/mb/policy/plugin.go	0.00%	5 Missing ⚠️
cmd/katalyst-agent/app/options/qrm/mb_plugin.go	33.33%	2 Missing ⚠️
pkg/agent/qrm-plugins/mb/advisor/advisor_helper.go	96.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1111      +/-   ##
==========================================
+ Coverage   61.45%   61.57%   +0.11%     
==========================================
  Files         783      785       +2     
  Lines       72974    73306     +332     
==========================================
+ Hits        44848    45135     +287     
- Misses      23142    23160      +18     
- Partials     4984     5011      +27     

Flag	Coverage Δ
unittest	61.57% <74.22%> (+0.11%)	⬆️

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.