Cleanup code which used to migrate from non-unicode to unicode

[darshanasbg]

Proposed changes in this pull request

$subject.

Reverts the changes done with,

• Store content based on the unicode support flag #284
• Add support to on-demand migrate notification template content to support unicode #290

& keeping only the original change,

• Store notification content as binary to support unicode #286

Related to,

• Have the ability to support non-latin unicode characters for email templates wso2/product-is#21235

When should this PR be merged

Immediate

Follow up actions

Merge

• Cleanup enable_unicode_support config wso2/carbon-identity-framework#6224
• (Temporary removed above and re-added with:Revert "Revert "Cleanup enable_unicode_support config"" wso2/carbon-identity-framework#6237
• Cleanup enable_unicode_support config wso2/product-is#22079

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 26 lines in your changes missing coverage. Please review.

Project coverage is 32.13%. Comparing base (2c2ed60) to head (9fbdc4f).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...mail/mgt/store/dao/AppNotificationTemplateDAO.java	0.00%	13 Missing ⚠️
...mail/mgt/store/dao/OrgNotificationTemplateDAO.java	0.00%	13 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #297      +/-   ##
============================================
+ Coverage     29.89%   32.13%   +2.24%     
  Complexity      479      479              
============================================
  Files            72       72              
  Lines          5142     4771     -371     
  Branches        687      616      -71     
============================================
- Hits           1537     1533       -4     
+ Misses         3449     3082     -367     
  Partials        156      156              

Flag	Coverage Δ
unit	16.34% <0.00%> (+0.44%)	⬆️

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