[virt-operator]: fix kubevirt version parsing

[enp0s3]

Signed-off-by: enp0s3 ibezukh@redhat.com

When the virt-operator image has digest instead of a tag, parse kubevirt version from KUBEVIRT_VERSION environment variable.

What this PR does / why we need it:
there was an issue when virt-operator image had digest instead of a tag, the hardcoded "latest" tag was used and KUBEVIRT_VERSION was ignored.

This led to an issue with tracking the kubevirt upgrade process. Periodic comparison of the KUBEVIRT_VERSION with the status.observedKubevirtVersion failed because the latter field got the latest string, instead of having the version as defined in KUBEVIRT_VERSION.

Fixes #
https://bugzilla.redhat.com/show_bug.cgi?id=2180146

Release note:

NONE

[enp0s3]

/cc @acardace
/cc @fossedihelm
/cc @tiraboschi

[jean-edouard]

/approve
@dhiller the PR was rebased to resolve a merge conflict, PTAL!

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jean-edouard

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[jean-edouard]

/cherry-pick release-0.59

[kubevirt-bot]

@jean-edouard: once the present PR merges, I will cherry-pick it on top of release-0.59 in a new PR and assign it to you.

In response to this:

/cherry-pick release-0.59

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[fossedihelm]

/lgtm

[kbidarkar]

/retest-required

[kubevirt-commenter-bot]

/retest-required
This bot automatically retries required jobs that failed/flaked on approved PRs.
Silence the bot with an /lgtm cancel or /hold comment for consistent failures.

[kubevirt-bot]

@enp0s3: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubevirt-fossa	f4a4fa3	link	false	/test pull-kubevirt-fossa

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[kubevirt-bot]

@jean-edouard: #9564 failed to apply on top of branch "release-0.59":

Applying: virt-operator: fix kubevirt version parsing
Using index info to reconstruct a base tree...
M	pkg/virt-operator/util/config.go
Falling back to patching base and 3-way merge...
Auto-merging pkg/virt-operator/util/config.go
CONFLICT (content): Merge conflict in pkg/virt-operator/util/config.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 virt-operator: fix kubevirt version parsing
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-0.59

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.