data-plane: enable contract validation rule

[ndr-brt]

What this PR changes/adds

As #1227 fixed date serdes, this PR enable ContractValidationRule.

Why it does that

To verify that the contract is still valid before transferring data.

Further notes

Linked Issue(s)

Closes #1127

Checklist

• added appropriate tests?
• performed checkstyle check locally?
• added/updated copyright headers?
• documented public classes/methods?
• added/updated relevant documentation?
• added relevant details to the changelog? (skip with label no-changelog)
• formatted title correctly? (take a look at the CONTRIBUTING and styleguide for details)

[codecov-commenter]

Codecov Report

Merging #1239 (a989be4) into main (39aa066) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main    #1239      +/-   ##
============================================
+ Coverage     59.19%   59.26%   +0.07%     
- Complexity     2830     2835       +5     
============================================
  Files           719      719              
  Lines         15705    15707       +2     
  Branches       1036     1037       +1     
============================================
+ Hits           9296     9309      +13     
+ Misses         5989     5978      -11     
  Partials        420      420              

Impacted Files	Coverage Δ
...taplane/sync/api/rules/ContractValidationRule.java	86.66% <100.00%> (+86.66%)	⬆️

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