Add CIBA related placeholder for sms templates

[shashimalcse]

Purpose

$subject

Related Issues

• Enhance Client Initiated Backchannel Authentication (CIBA) wso2/product-is#23153

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.78%. Comparing base (e323b93) to head (34ae922).
Report is 7 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #37      +/-   ##
============================================
+ Coverage     60.72%   60.78%   +0.06%     
- Complexity      226      240      +14     
============================================
  Files            23       23              
  Lines          1110     1150      +40     
  Branches        105      117      +12     
============================================
+ Hits            674      699      +25     
- Misses          369      386      +17     
+ Partials         67       65       -2     

Flag	Coverage Δ
unit	29.05% <ø> (+0.12%)	⬆️

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