🐛 WIP: Updating error message when no successors available

[dhoover103]

Description

This is an update to error messages received when trying to upgrade an operator, per #1022

Reviewer Checklist

• [ ] API Go Documentation
• [ ] Tests: Unit Tests (and E2E Tests, if appropriate)
• [ ] Comprehensive Commit Messages
• [ ] Links to related GitHub Issue(s)

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 60.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 72.43%. Comparing base (06b2455) to head (6962c0c). Report is 38 commits behind head on main.

Files	Patch %	Lines
internal/resolve/catalog.go	60.00%	8 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1083      +/-   ##
==========================================
- Coverage   72.74%   72.43%   -0.31%     
==========================================
  Files          33       33              
  Lines        1948     1959      +11     
==========================================
+ Hits         1417     1419       +2     
- Misses        381      390       +9     
  Partials      150      150              

Flag	Coverage Δ
e2e	55.89% <35.00%> (-0.22%)	:arrow_down:
unit	45.17% <60.00%> (-0.16%)	:arrow_down:

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[openshift-merge-robot]

PR needs rebase.

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