github: Fix bundle version labelling

[lyarwood]

What this PR does / why we need it:

• Replace the annotation with a label
• Avoid merging bundles togther when using yq
• Remove unnecessary exports of env variables

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Release note:

NONE

[lyarwood]

Tested below and now working correctly:

https://github.com/lyarwood/common-instancetypes/releases/tag/v1.2.7

$ curl -Ls https://github.com/lyarwood/common-instancetypes/releases/download/v1.2.7/common-clusterinstancetypes-bundle-v1.2.7.yaml | grep kind | sort | uniq
kind: VirtualMachineClusterInstancetype

$ curl -Ls https://github.com/lyarwood/common-instancetypes/releases/download/v1.2.7/common-clusterinstancetypes-bundle-v1.2.7.yaml | yq '.metadata.labels["instancetype.kubevirt.io/common-instancetypes-version"
]' | sort | uniq
---
v1.2.7

$ curl -Ls https://github.com/lyarwood/common-instancetypes/releases/download/v1.2.7/common-clusterpreferences-bundle-v1.2.7.yaml | grep kind | sort | uniq
kind: VirtualMachineClusterPreference

$ curl -Ls https://github.com/lyarwood/common-instancetypes/releases/download/v1.2.7/common-clusterpreferences-bundle-v1.2.7.yaml | yq '.metadata.labels["instancetype.kubevirt.io/common-instancetypes-version"]'
 | sort | uniq
---
v1.2.7

[lyarwood]

FWIW this is just pre-commit cleaning up whitespace that shellcheck somehow missed.

[0xFelix]

/approve
/lgtm

[kubevirt-bot]

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This pull-request has been approved by: 0xFelix

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[lyarwood]

/cherry-pick release-0.3

[kubevirt-bot]

@lyarwood: new pull request created: #85

In response to this:

/cherry-pick release-0.3

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