test(core-p2p): clear mock in transaction broadcaster test

[rainydio]

Resetting mock, resets implementation too. jest.fn(() => "value") returns undefined after reset. Clearing only resets call stats. In this test it didn't mattered, but it did in other. To be consistent broadcaster test also was updated.

• Documentation
• Tests
• Ready to be merged

[codecov]

Codecov Report

Merging #3531 into 3.0 will decrease coverage by 38.3%.
The diff coverage is 2.62%.

@@            Coverage Diff             @@
##              3.0   #3531       +/-   ##
==========================================
- Coverage   48.12%   9.82%   -38.31%     
==========================================
  Files         539     548        +9     
  Lines       13549   13861      +312     
  Branches     1824    1902       +78     
==========================================
- Hits         6521    1362     -5159     
- Misses       6999   12476     +5477     
+ Partials       29      23        -6

Impacted Files	Coverage Δ
packages/core-p2p/src/utils/build-rate-limiter.ts	0% <ø> (-66.67%)	⬇️
...s/core-test-framework/src/app/generators/crypto.ts	91.17% <ø> (ø)	⬆️
packages/core-p2p/src/schemas.ts	0% <ø> (-100%)	⬇️
...kages/crypto/src/transactions/types/transaction.ts	0% <ø> (-78.38%)	⬇️
packages/crypto/src/validation/schemas.ts	0% <ø> (-100%)	⬇️
packages/core-api/src/resources/delegate.ts	80% <ø> (ø)	⬆️
...ges/core-magistrate-api/src/routes/bridgechains.ts	0% <ø> (ø)	⬆️
packages/core-p2p/src/utils/socket.ts	0% <ø> (-11.54%)	⬇️
packages/core/src/commands/snapshot-rollback.ts	0% <ø> (-50%)	⬇️
...ypto/src/transactions/utils/bridgechain-schemas.ts	0% <ø> (-100%)	⬇️
... and 342 more

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