feat: support delete all credentials from keyring

[sweatybridge]

What kind of change does this PR introduce?

feature

What is the new behavior?

Extend keyring to delete all credentials on all platforms.

Additional context

Add any other context or screenshots.

[coveralls]

Pull Request Test Coverage Report for Build 10813817559

Details

• 11 of 22 (50.0%) changed or added relevant lines in 2 files are covered.
• 7 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.07%) to 60.017%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/utils/credentials/store.go	0	3	0.0%
internal/utils/credentials/keyring_linux.go	11	19	57.89%

Files with Coverage Reduction	New Missed Lines	%
internal/projects/create/create.go	2	34.88%
internal/gen/keys/keys.go	5	12.9%

Totals
Change from base Build 10811179040:	-0.07%
Covered Lines:	6384
Relevant Lines:	10637

---

💛 - Coveralls

[avallete]

Indeed much less code than my version 😅

I'll refactor my PR for linux and osx on my branch to match it.

Also I've opened a PR over the go-keyring package: zalando/go-keyring#112 which has been looked at.

With a bit of luck we won't have too keep maintaining that for long 👍