[improvement][breaking] : remove deprecated vpcname flag

[rahulait]

General:

Its been more than 8+ months since we deprecated vpcname flag. This PR removes the deprecated flag.

Note:
This is a breaking change for those who are running within VPC and haven't updated to start using vpcnames if they are currently using vpcname. One should start using the newer flags to avoid any issues.

• Have you removed all sensitive information, including but not limited to access keys and passwords?
• Have you checked to ensure there aren't other open or closed Pull Requests for the same bug/feature/question?

Pull Request Guidelines:

1. Does your submission pass tests?
2. Have you added tests?
3. Are you addressing a single feature in this PR?
4. Are your commits atomic, addressing one change per commit?
5. Are you following the conventions of the language?
6. Have you saved your large formatting changes for a different PR, so we can focus on your work?
7. Have you explained your rationale for why this feature is needed?
8. Have you linked your PR to an open issue

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.33%. Comparing base (5a59a82) to head (9f075c5).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #417      +/-   ##
==========================================
- Coverage   75.39%   75.33%   -0.06%     
==========================================
  Files          16       16              
  Lines        2983     2976       -7     
==========================================
- Hits         2249     2242       -7     
  Misses        545      545              
  Partials      189      189              

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