Add In-Place upgrade for APK upgrading

[pubudu538]

Purpose

This PR contains the following changes.

1. Updated Helm readme using helm docs.
2. Added In-Place upgrade readme.
3. Fixed issues in metrics related changes
4. Templated hard-corded values.

Fixes - #2209
Fixes - #2210

Goals

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Approach

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User stories

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Release note

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Documentation

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Training

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Certification

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Marketing

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Automation tests

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• Integration tests

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Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes/no
• Ran FindSecurityBugs plugin and verified report? yes/no
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes/no

Samples

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Related PRs

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Migrations (if applicable)

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Test environment

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Learning

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[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.75%. Comparing base (9678fcb) to head (cc9d84b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2206   +/-   ##
=======================================
  Coverage   27.75%   27.75%           
=======================================
  Files         124      124           
  Lines       14692    14692           
  Branches     2681     2681           
=======================================
  Hits         4078     4078           
  Misses      10483    10483           
  Partials      131      131           

Flag	Coverage Δ
adapter	27.33% <ø> (ø)
common-controller	4.07% <ø> (ø)
config-deployer-service	25.99% <ø> (ø)
idp-domain-service	80.21% <ø> (ø)

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