chore(contracts): Add a safety check against data corruption

[satyajeetkolhapure]

What does this PR do?

Checks attestation id is valid or not before generating it and using it

Related ticket

Fixes #808

Type of change

• Chore
• Bug fix
• New feature
• Documentation update

Check list

• Unit tests for any smart contract change
• Contracts and functions are documented

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 74.24%. Comparing base (bc9809b) to head (58e8223).

Files with missing lines	Patch %	Lines
contracts/src/AttestationRegistry.sol	50.00%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              dev     #839       +/-   ##
===========================================
+ Coverage   48.59%   74.24%   +25.65%     
===========================================
  Files          18       51       +33     
  Lines         391      893      +502     
  Branches       63      186      +123     
===========================================
+ Hits          190      663      +473     
- Misses        198      224       +26     
- Partials        3        6        +3     

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