Adds missing cli tests in x/staking

[atheeshp]

ref: #7067

Description

closes: #XXXX

---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[codecov]

Codecov Report

Merging #7158 into master will increase coverage by 1.31%.
The diff coverage is 51.33%.

@@            Coverage Diff             @@
##           master    #7158      +/-   ##
==========================================
+ Coverage   55.60%   56.91%   +1.31%     
==========================================
  Files         457      585     +128     
  Lines       27440    40685   +13245     
==========================================
+ Hits        15257    23155    +7898     
- Misses      11083    15582    +4499     
- Partials     1100     1948     +848     

[robert-zaremba]

I thought the Codecov was fixed. It's still there and it's breaking the review experience.

[alessio]

I thought the Codecov was fixed. It's still there and it's breaking the review experience.

What made you think so? The conversation got stuck.