fix(mergify): do not wait for deprecated Cloud Build

[gustavovalverde]

Motivation

Cloud Build was recently removed, and Mergify is expecting a result from a non-existing action.

Solution

Remove cloud build check from Mergify's as a requirement for speculative checks.

Review

@conradoplg

[conradoplg]

Thanks!

[codecov]

Codecov Report

Merging #3509 (53d9ded) into main (499ae89) will increase coverage by 0.23%.
The diff coverage is 74.66%.

@@            Coverage Diff             @@
##             main    #3509      +/-   ##
==========================================
+ Coverage   78.34%   78.57%   +0.23%     
==========================================
  Files         267      273       +6     
  Lines       31526    31900     +374     
==========================================
+ Hits        24698    25066     +368     
- Misses       6828     6834       +6     

[teor2345]

The macOS job took 90 minutes to fetch the parameters, and the command didn't actually output any logs.
(I think it usually outputs info-level logs, but maybe the defaults are different for an example command.)
https://github.com/ZcashFoundation/zebra/runs/5146825555?check_suite_focus=true#step:12:13

So I restarted the CI jobs.