Port generic Helm upgrade functionality to CE

What does this MR do?

Port the following from EE to CE

• BaseHelmService#upgrade_command
• Clusters::Applications::Prometheus#upgrade_command

I think the next MR will be porting ClusterWaitForAppUpdateWorker and CheckUpgradeProgressService and some generic version of PrometheusUpdateService that we will override in EE.

What are the relevant issue numbers?

#55544 (moved), #49384 (closed)

Does this MR meet the acceptance criteria?

• [-] Changelog entry added, if necessary
• [-] Documentation created/updated
• Tests added for this feature/bug
• [-] Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• [-] Conforms to the database guides
• [-] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer