refactor: finish the Solana repository implementation

[renan061]

Description

TODO.

Closes #4224.

How Has This Been Tested?

• [ ] Tested CCTX in localnet
• [ ] Tested in development environment
• [x] Go unit tests
• [x] Go integration tests
• [x] Tested via GitHub Actions

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✨ Finishing touches

🧪 Generate unit tests (beta)

• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment
• [ ] Commit unit tests in branch feature/solana-repository

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[codecov[bot]]

Codecov Report

:x: Patch coverage is 52.19780% with 87 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 65.09%. Comparing base (1487fca) to head (7418bc6). :warning: Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
zetaclient/chains/solana/observer/inbound.go	0.00%	39 Missing :warning:
zetaclient/chains/solana/repo/repo.go	69.79%	29 Missing :warning:
zetaclient/chains/solana/signer/signer.go	66.66%	5 Missing :warning:
...taclient/chains/solana/observer/inbound_tracker.go	0.00%	4 Missing :warning:
zetaclient/chains/solana/signer/execute.go	0.00%	3 Missing :warning:
...aclient/orchestrator/preflight_metrics_reporter.go	0.00%	3 Missing :warning:
zetaclient/chains/solana/observer/observer.go	50.00%	1 Missing :warning:
.../chains/solana/signer/outbound_tracker_reporter.go	0.00%	1 Missing :warning:
zetaclient/chains/solana/signer/withdraw_spl.go	0.00%	1 Missing :warning:
zetaclient/dry/dry.go	0.00%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4422      +/-   ##
===========================================
+ Coverage    64.75%   65.09%   +0.33%     
===========================================
  Files          469      470       +1     
  Lines        28522    28510      -12     
===========================================
+ Hits         18470    18558      +88     
+ Misses        9031     8932      -99     
+ Partials      1021     1020       -1     

Files with missing lines	Coverage Δ
zetaclient/chains/solana/observer/gas.go	100.00% <100.00%> (ø)
zetaclient/chains/solana/observer/outbound.go	43.54% <100.00%> (-0.90%)	:arrow_down:
zetaclient/chains/solana/repo/errors.go	100.00% <100.00%> (ø)
zetaclient/chains/solana/solana.go	54.16% <ø> (ø)
zetaclient/mode/chaos/generate/main.go	0.00% <ø> (ø)
zetaclient/mode/chaos/generated.go	0.00% <ø> (ø)
zetaclient/orchestrator/bootstrap.go	60.28% <100.00%> (ø)
zetaclient/chains/solana/observer/observer.go	45.94% <50.00%> (-1.43%)	:arrow_down:
.../chains/solana/signer/outbound_tracker_reporter.go	0.00% <0.00%> (ø)
zetaclient/chains/solana/signer/withdraw_spl.go	0.00% <0.00%> (ø)
... and 7 more

... and 2 files with indirect coverage changes

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