[jfrog-platform] tolerations on pre-upgrade-hook job

[gpongelli]

PR Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• [x] Chart Version bumped
• [x] CHANGELOG.md updated
• [ ] Variables and other changes are documented in the README.md
• [x] Title of the PR starts with chart name (e.g. [artifactory])

What this PR does / why we need it: This PR adds toleration for pre-upgrade-hook job. Without this PR, JFrog can't upgrade itself because jfrog-platform-pre-upgrade-hook remains in pending state when nodes are all tainted.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): n/a

Special notes for your reviewer: n/a

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[gpongelli]

I have read the CLA Document and I hereby sign the CLA

[gpongelli]

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