Functional tests: add a parameter for the full site cleaning test

[davlgd]

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Description

Fix #4876

The latest mc rb test clean all the site data, and on the demo site, there are sometimes WORM objects put by some users and it leads to an failure. This test should only be run on sites on which the user knows he can clean everything without errors

Motivation and Context

I need to run functional tests without errors on the demo site, even if some user put WORM objects in it. The COMPLETE_RB_TEST allow to run the "clean everything" test when the user needs it. The parameter name can be changed if it doesn't comply to any mc development rule.

How to test this PR?

Launch make test with COMPLETE_RB_TEST parameter set to false/true

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Unit tests added/updated
• Internal documentation updated
• Create a documentation update request here

[bh4t]

@harshavardhana PTAL when you get a chance.