refactor(observer): rename MsgAddBlameVote to MsgVoteBlame

[lumtis]

Description

To keep consistency with all voting messages

Closes: #2201

[github-actions]

!!!WARNING!!!
nosec detected in the following files: x/observer/client/cli/tx_vote_blame.go

Be very careful about using #nosec in code. It can be a quick way to suppress security warnings and move forward with development, it should be employed with caution. Suppressing warnings with #nosec can hide potentially serious vulnerabilities. Only use #nosec when you're absolutely certain that the security issue is either a false positive or has been mitigated in another way.

Only suppress a single rule (or a specific set of rules) within a section of code, while continuing to scan for other problems. To do this, you can list the rule(s) to be suppressed within the #nosec annotation, e.g: /* #nosec G401 */ or //#nosec G201 G202 G203
Broad #nosec annotations should be avoided, as they can hide other vulnerabilities. The CI will block you from merging this PR until you remove #nosec annotations that do not target specific rules.

Pay extra attention to the way #nosec is being used in the files listed above.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.07%. Comparing base (85861be) to head (ff067ce).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2290   +/-   ##
========================================
  Coverage    69.07%   69.07%           
========================================
  Files          269      269           
  Lines        16436    16436           
========================================
  Hits         11353    11353           
  Misses        4599     4599           
  Partials       484      484           

Files	Coverage Δ
x/crosschain/types/authz.go	100.00% <100.00%> (ø)
x/observer/keeper/msg_server_vote_blame.go	92.00% <100.00%> (ø)
x/observer/types/message_vote_blame.go	100.00% <100.00%> (ø)
zetaclient/zetacore/tx.go	53.72% <100.00%> (ø)

[kingpinXD]

lgtm , left a minor comment