[TEST] Add End To End Testing For Anchor Update Proposal over Signature Bridge and the DKG

[shekohex]

Summary of changes
Changes introduced in this pull request:

• E2E Testing for Anchor Updates

Reference issue to close (if applicable)

Closes #107

[codecov-commenter]

Codecov Report

Merging #179 (f07604a) into master (3dc9745) will increase coverage by 0.09%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #179      +/-   ##
==========================================
+ Coverage   62.66%   62.75%   +0.09%     
==========================================
  Files          65       68       +3     
  Lines        8343     8426      +83     
==========================================
+ Hits         5228     5288      +60     
- Misses       3115     3138      +23     

Impacted Files	Coverage Δ
...ntime-primitives/src/handlers/evm/anchor_update.rs	92.30% <0.00%> (ø)
dkg-runtime-primitives/src/proposal.rs	44.69% <0.00%> (-2.89%)	⬇️
dkg-gadget/src/worker.rs	0.00% <0.00%> (ø)
...rimitives/src/handlers/evm/fee_recipient_update.rs	87.50% <0.00%> (ø)
...untime-primitives/src/handlers/evm/set_verifier.rs	87.50% <0.00%> (ø)
...rimitives/src/handlers/evm/set_treasury_handler.rs	87.50% <0.00%> (ø)
pallets/dkg-proposal-handler/src/tests.rs	97.54% <0.00%> (+0.21%)	⬆️
...untime-primitives/src/handlers/decode_proposals.rs	56.48% <0.00%> (+0.56%)	⬆️

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