Fixing up README badges and adding CLOMonitor

[jkowall]

Which problem is this PR solving?

Improvements for #5363

Description of the changes

I have fixed the variables for the badge management and also added our badge for CLOMontior which is what the CNCF seems to be using most often.

How was this change tested?

Viewed the README.md and badges

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
• [NA] I have added unit tests for the new functionality
• [NA] I have run lint and test steps successfully

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.20%. Comparing base (ceb1d25) to head (ec6390e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5371   +/-   ##
=======================================
  Coverage   95.20%   95.20%           
=======================================
  Files         343      343           
  Lines       16781    16781           
=======================================
  Hits        15976    15976           
  Misses        606      606           
  Partials      199      199           

Flag	Coverage Δ
badger	10.51% <ø> (ø)
cassandra-3.x	18.42% <ø> (ø)
cassandra-4.x	18.42% <ø> (ø)
elasticsearch-5.x	20.87% <ø> (-0.02%)	⬇️
elasticsearch-6.x	20.87% <ø> (ø)
elasticsearch-7.x	20.92% <ø> (-0.02%)	⬇️
elasticsearch-8.x	21.11% <ø> (-0.02%)	⬇️
grpc	14.59% <ø> (ø)
kafka	10.17% <ø> (ø)
opensearch-1.x	20.98% <ø> (ø)
opensearch-2.x	20.98% <ø> (ø)
unittests	91.72% <ø> (ø)

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