CRM: Moves clearing of roles to uninstall hook and returns early if a CRM role is found during role creation

[mikestottuk]

Fixes #

Proposed changes:

• Returns early if a CRM user role is found
• Moves the removal of CRM roles to the uninstall hook

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
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Jetpack product discussion

Does this pull request change what data or activity we track or use?

Testing instructions:

• This change should only destroy CRM user roles when the plugin is deleted, not each time it is activated. In addition the creation of roles will return early if a role is found.

In a future enhancement, we should consider delaying the creation of additional CRM roles until the CRM operate decides they need them.

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[jp-launch-control]

Code Coverage Summary

Coverage changed in 3 files.

File	Coverage	Δ%	Δ Uncovered
projects/plugins/crm/ZeroBSCRM.php	0/179 (0.00%)	0.00%	8 💔
projects/plugins/crm/includes/ZeroBSCRM.Permissions.php	0/456 (0.00%)	0.00%	2 ❤️‍🩹
projects/plugins/crm/includes/ZeroBSCRM.Core.php	0/972 (0.00%)	0.00%	-1 💚

Full summary · PHP report

_{Coverage check overridden by I don't care about code coverage for this PR Use this label to ignore the check for insufficient code coveage. .}

[tbradsha]

Two thoughts:

1. Obviously this code predates me, but I suspect the goal with clearing the roles prior to creation is that if the role perms change they wouldn't be properly set up.
2. Is it really safe to assume that if a role exists, it's set up properly? I'd be more comfortable setting them up from a clean slate.