Skip ExtPolicy delete test on distros without GuestConfig support

[mgunnala]

Description

Issue #

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Azure policy automatically installs GuestConfig on test machines, which may occur while CRP is waiting for a disallowed delete request to timeout (test case 5) and reset the timeout period. As a workaround, we manually install GuestConfig on supported distros, but Azure policy may still attempt to install on unsupported distros. This PR skips test case 5 on any distros not supported by GuestConfig.

PR information

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• New Unit tests were added for the changes made

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