client: print last stake ration and improve msg on zero inflation

[tzemanovic]

Describe your changes

When the PoS inflation is 0 the client printed PoS inflation and rewards are not currently enabled. assuming it's not enabled. This PR adds additional query to print last staked ratio which may cause the inflation to go to 0 when its over the target_staked_ratio and changes the message to No PoS inflation and rewards tokens were minted. that can apply to either case.

Checklist before merging

• If this PR has some consensus breaking changes, I added the corresponding breaking:: labels
  • This will require 2 reviewers to approve the changes
• If this PR requires changes to the docs or specs, a corresponding PR is opened in the namada-docs repo
  • Relevant PR if applies:
• If this PR affects services such as namada-indexer or namada-masp-indexer, a corresponding PR is opened in that repo
  • Relevant PR if applies:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.58%. Comparing base (7169a3f) to head (612a69c).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4241      +/-   ##
==========================================
- Coverage   74.59%   74.58%   -0.01%     
==========================================
  Files         342      342              
  Lines      108771   108771              
==========================================
- Hits        81135    81132       -3     
- Misses      27636    27639       +3     

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