Refactor resource deletion scripts

What does this MR do and why?

Refactor resource deletion scripts

• Refactors common methods to base resource deletion class - institutes a cut off to prevent timeout failures and no longer uses x_total_pages as that can lead to silent failures when it is not returned when responses contain over 10,000 items.
• Adds snippet deletion
• Adds dry run capabilities
• Adds DELETE_BEFORE environment variable
• Adds improved logging messages

Part of gitlab-org/quality/quality-engineering/team-tasks#2586 (closed) and gitlab-org/quality/quality-engineering/team-tasks#2539 (closed)

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