fix: fix bugs on aborting x/foundation proposals

[0Tech]

Description

This patch will fix the stopping logic in the iteration of the abortOldProposals(), and add the corresponding unit test.
It also fixes the misleading variable names of proposal in the test.

Motivation and context

It didn't update the state of the latest proposals (to aborted), if there are proposals of multiple foundation versions.

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly.
• I have updated API documentation client/docs/swagger-ui/swagger.yaml

[codecov]

Codecov Report

Merging #687 (5e06b60) into main (47eeccc) will increase coverage by 0.03%.
The diff coverage is 0.00%.

❗ Current head 5e06b60 differs from pull request most recent head afd6097. Consider uploading reports for the commit afd6097 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #687      +/-   ##
==========================================
+ Coverage   61.01%   61.04%   +0.03%     
==========================================
  Files         873      873              
  Lines       98429    98429              
==========================================
+ Hits        60054    60090      +36     
+ Misses      34787    34740      -47     
- Partials     3588     3599      +11     

Impacted Files	Coverage Δ
x/foundation/keeper/proposal.go	65.49% <0.00%> (ø)
x/foundation/foundation.go	74.72% <0.00%> (-1.09%)	⬇️
x/foundation/msgs.go	39.42% <0.00%> (-0.49%)	⬇️
x/token/msgs.go	34.51% <0.00%> (+4.06%)	⬆️
x/collection/msgs.go	43.70% <0.00%> (+5.37%)	⬆️
x/token/validation.go	76.36% <0.00%> (+5.45%)	⬆️