chore(JSON-RPC,execution): consolidate repeating test code

[yair-starkware]

Pull Request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build-related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this introduce a breaking change?

• Yes
• No

Other information

---

This change is 

[codecov]

Codecov Report

Merging #1102 (f26af4b) into main (93be831) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main    #1102   +/-   ##
=======================================
  Coverage   74.19%   74.19%           
=======================================
  Files          73       73           
  Lines        6642     6642           
  Branches     6642     6642           
=======================================
  Hits         4928     4928           
  Misses        873      873           
  Partials      841      841           

Files Changed	Coverage Δ
crates/papyrus_execution/src/objects.rs	40.80% <0.00%> (ø)
crates/papyrus_rpc/src/v0_4_0/api/mod.rs	44.58% <0.00%> (ø)

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[dan-starkware]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @yair-starkware)

[yair-starkware]

crates/papyrus_execution/src/objects.rs line 128 at r2 (raw file):

/// The execution trace of an L1Handler transaction.
#[derive(Clone, Debug, Serialize, Deserialize, Eq, PartialEq)]

I'm not sure why reviewable is showing this like a new code - I just added Eq + PartialEq to the derive

[dan-starkware]

Reviewed 3 of 3 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @yair-starkware)