feat: add congestion multiplier metric

[MiroslavGatsanoga]

Description:

Related issue(s):

Fixes #7003

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (70c450e)	96090	68316	71.10%
Head commit (b382da3)	96101 (+11)	68325 (+9)	71.10% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#17286)	13	13	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.24%. Comparing base (70c450e) to head (b382da3).

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17286      +/-   ##
============================================
- Coverage     67.24%   67.24%   -0.01%     
  Complexity    21991    21991              
============================================
  Files          2583     2584       +1     
  Lines         96307    96318      +11     
  Branches      10054    10054              
============================================
+ Hits          64763    64770       +7     
- Misses        27839    27841       +2     
- Partials       3705     3707       +2     

Files with missing lines	Coverage Δ
...om/hedera/node/app/throttle/CongestionMetrics.java	100.00% <100.00%> (ø)
...dera/node/app/workflows/handle/HandleWorkflow.java	67.76% <100.00%> (+0.19%)	⬆️

... and 2 files with indirect coverage changes