🏃[e2e]: add namespace utils to the test framework

[fabriziopandini]

What this PR does / why we need it:
This PR introduces utilities to the E2E framework to be used for running each test spec in a dedicated namespace on the management cluster:

• create namespace
• stream namespace events to a log file
• delete namespace

Which issue(s) this PR fixes:
xref #2753
xref #2637
xref #2636

/assign @vincepri
/assign @sedefsavas

[detiber]

Any particular reason to require a Name on input for CreateNamespace?

Could you make Name optional and default to "test-" + util.RandomString(6) if not provided? Otherwise downstream providers consuming this would still have to implement their own randomization.

[neolit123]

informatively, the k/k framework:

• (in the default Before function)
• takes the test name as input
• adds a UUID after the test name
• loops to make sure a namespace name+uuid does not exist
• creates the namespace
• (in the default After function)
• deletes the namespace

[fabriziopandini]

@detiber Done!
@neolit123 yes, we are following a similar path

[fabriziopandini]

@detiber @neolit123 thanks for the feedback!
comment addressed

[detiber]

@fabriziopandini thanks! lgtm

[sedefsavas]

/lgtm

[vincepri]

/approve

[vincepri]

/milestone v0.3.4

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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