fix: logout and minor improvements

[blva]

Proposed changes

Clarification change - mentions what profile is being logged out

❯ ./bin/atlas logout -P other-p --debug
? Are you sure you want to log out of account with public API key default from profile other-p? (y/N)

❯ ./bin/atlas logout
? Are you sure you want to clear profile default? (y/N)

Checklist

• I have signed the MongoDB CLA
• I have added tests that prove my fix is effective or that my feature works
• I have added any necessary documentation in document requirements section listed in CONTRIBUTING.md (if appropriate)
• I have addressed the @mongodb/docs-cloud-team comments (if appropriate)
• I have updated test/README.md (if an e2e test has been added)
• I have run make fmt and formatted my code

Further comments

[coveralls]

coverage: 64.155% (+0.001%) from 64.154%
when pulling b55400c on sa-logout
into 3326d90 on master.