Store content based on the unicode support flag

[darshanasbg]

Proposed changes in this pull request

$subject. This handles the core logic for the config introduced in:

• Add config to indicate the unicode support wso2/carbon-identity-framework#6142

This temporal behavior enables onboarding the change,

• Store notification content as binary to support unicode wso2/carbon-identity-framework#6120
• Store notification content as binary to support unicode #280
  in a graceful manner when the previous schema is already in use.

Related to,

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

When should this PR be merged

After merging wso2/carbon-identity-framework#6142

Follow up actions

N/A

[codecov]

Codecov Report

Attention: Patch coverage is 3.03030% with 64 lines in your changes missing coverage. Please review.

Project coverage is 32.97%. Comparing base (05ec7dc) to head (cc954ab).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
...mail/mgt/store/dao/AppNotificationTemplateDAO.java	3.03%	32 Missing ⚠️
...mail/mgt/store/dao/OrgNotificationTemplateDAO.java	3.03%	32 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #284      +/-   ##
============================================
- Coverage     33.29%   32.97%   -0.32%     
  Complexity      507      507              
============================================
  Files            72       72              
  Lines          4641     4691      +50     
  Branches        560      574      +14     
============================================
+ Hits           1545     1547       +2     
- Misses         2942     2990      +48     
  Partials        154      154              

Flag	Coverage Δ
unit	16.69% <3.03%> (-0.21%)	⬇️

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Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/11937934882