Release Training Operator Image for v1.8.0-rc.1

[andreyvelich]

I updated image tag for v1.8.0-rc.1 release.

/assign @kubeflow/wg-training-leads

[google-oss-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tenzen-y

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubeflow/training-operator/blob/v1.8-branch/OWNERS)~~ [tenzen-y] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[coveralls]

Pull Request Test Coverage Report for Build 9666154214

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 35.414%

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Totals
Change from base Build 9665440033:	0.02%
Covered Lines:	4379
Relevant Lines:	12365

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💛 - Coveralls

[tenzen-y]

/hold cancel