Add email template for email OTP verification on claim update

[JayaShakthi97]

Proposed changes in this pull request

[List all changes you want to add here. If you fixed an issue, please
add a reference to that issue as well.]

When should this PR be merged

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can merge this pull request.]

Follow up actions

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migrations, software that we need to install on staging and production
environments.]

Developer Checklist (Mandatory)

• Complete the Developer Checklist in the related product-is issue to track any behavioral change or migration impact.

Checklist (for reviewing)

General

• Is this PR explained thoroughly? All code changes must be accounted for in the PR description.
• Is the PR labeled correctly?

Functionality

• Are all requirements met? Compare implemented functionality with the requirements specification.
• Does the UI work as expected? There should be no Javascript errors in the console; all resources should load. There should be no unexpected errors. Deliberately try to break the feature to find out if there are corner cases that are not handled.

Code

• Do you fully understand the introduced changes to the code? If not ask for clarification, it might uncover ways to solve a problem in a more elegant and efficient way.
• Does the PR introduce any inefficient database requests? Use the debug server to check for duplicate requests.
• Are all necessary strings marked for translation? All strings that are exposed to users via the UI must be marked for translation.

Tests

• Are there sufficient test cases? Ensure that all components are tested individually; models, forms, and serializers should be tested in isolation even if a test for a view covers these components.
• If this is a bug fix, are tests for the issue in place? There must be a test case for the bug to ensure the issue won’t regress. Make sure that the tests break without the new code to fix the issue.
• If this is a new feature or a significant change to an existing feature? has the manual testing spreadsheet been updated with instructions for manual testing?

Security

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• Are all UI and API inputs run through forms or serializers?
• Are all external inputs validated and sanitized appropriately?
• Does all branching logic have a default case?
• Does this solution handle outliers and edge cases gracefully?
• Are all external communications secured and restricted to SSL?

Documentation

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• Are changes to the API documented in the API docs? If this PR introduces new API functionality or changes existing ones, the changes must be documented.
• Are reusable components documented? If this PR introduces components that are relevant to other developers (for instance a mixin for a view or a generic form) they should be documented in the Wiki.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.31%. Comparing base (909c83b) to head (b3921cd).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #372      +/-   ##
============================================
+ Coverage     36.53%   37.31%   +0.78%     
- Complexity      680      687       +7     
============================================
  Files            78       78              
  Lines          6452     6451       -1     
  Branches       1071     1071              
============================================
+ Hits           2357     2407      +50     
+ Misses         3841     3782      -59     
- Partials        254      262       +8     

Flag	Coverage Δ
unit	23.88% <ø> (+0.99%)	⬆️

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