refactor: perform some various renaming fixes

[lumtis]

Description

Address some of the points of the attached renaming issue.
Some were left untouched:

• renaming ob: I think ob naming is fine now that we have refactoring the observer object into its own package
• Cctx, Tss -> CCTX, TSS: this would be part of a bigger refactoring as some message would need to be changed and implying breaking changes. Also we will still have some occurences since proto generation doesn't recognize acronyms (this is the same for Btc -> BTC and Eth -> ETH)

Closes: #2027

[codecov]

Codecov Report

Attention: Patch coverage is 48.38710% with 16 lines in your changes missing coverage. Please review.

Project coverage is 68.30%. Comparing base (3f02526) to head (d7c196d).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2323   +/-   ##
========================================
  Coverage    68.30%   68.30%           
========================================
  Files          299      299           
  Lines        18905    18905           
========================================
  Hits         12913    12913           
  Misses        5355     5355           
  Partials       637      637           

Files	Coverage Δ
x/crosschain/keeper/cctx_gateway_zevm.go	100.00% <100.00%> (ø)
x/crosschain/keeper/process_outbound.go	94.01% <100.00%> (ø)
x/crosschain/types/cctx.go	95.41% <100.00%> (ø)
x/observer/keeper/msg_server_vote_block_header.go	92.59% <100.00%> (ø)
x/observer/keeper/vote_inbound.go	88.57% <100.00%> (ø)
x/observer/keeper/vote_outbound.go	88.88% <100.00%> (ø)
zetaclient/chains/evm/observer/inbound.go	41.32% <100.00%> (ø)
zetaclient/orchestrator/orchestrator.go	25.40% <ø> (ø)
zetaclient/zetacore/tx.go	53.72% <ø> (ø)
zetaclient/chains/bitcoin/observer/inbound.go	14.72% <0.00%> (ø)
... and 3 more