Add coverage, gha, jenkins server, documentation and forum badges

[dreamer-89]

Signed-off-by: Suraj Singh [email protected]

Description

Adds badges to readme for different jobs listed below

1. GHA gradle check
2. GHA precommit
3. GHA validate pull request
4. Public jenkins gradle check
5. Documentation
6. Forum

Issues Resolved

#1323

Related

#850

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/543/
• CommitID: 3823227

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/548/
• CommitID: 3823227

[codecov-commenter]

Codecov Report

Merging #3889 (3823227) into 2.1 (cd6493f) will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.1    #3889      +/-   ##
============================================
+ Coverage     70.63%   70.66%   +0.02%     
+ Complexity    56382    56351      -31     
============================================
  Files          4515     4515              
  Lines        271418   271418              
  Branches      39958    39958              
============================================
+ Hits         191728   191804      +76     
+ Misses        63585    63462     -123     
- Partials      16105    16152      +47     

Impacted Files	Coverage Δ
...ch/transport/ReceiveTimeoutTransportException.java	50.00% <0.00%> (-50.00%)	⬇️
...cluster/coordination/PendingClusterStateStats.java	20.00% <0.00%> (-48.00%)	⬇️
...main/java/org/opensearch/ingest/ProcessorInfo.java	21.05% <0.00%> (-47.37%)	⬇️
...pensearch/action/ingest/DeletePipelineRequest.java	31.25% <0.00%> (-37.50%)	⬇️
...readonly/TransportVerifyShardIndexBlockAction.java	51.21% <0.00%> (-31.71%)	⬇️
...rc/main/java/org/opensearch/ingest/IngestInfo.java	51.72% <0.00%> (-27.59%)	⬇️
...va/org/opensearch/monitor/process/ProcessInfo.java	68.00% <0.00%> (-24.00%)	⬇️
...rg/opensearch/index/shard/ShardSplittingQuery.java	53.43% <0.00%> (-21.38%)	⬇️
...ch/persistent/decider/EnableAssignmentDecider.java	59.09% <0.00%> (-18.19%)	⬇️
...ter/coordination/CoordinationStateTestCluster.java	73.17% <0.00%> (-17.69%)	⬇️
... and 469 more

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[dreamer-89]

Moved badges after logo & change ordering of badges.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/607/
• CommitID: cc82802

[dblock]

2.1 is for security patches only