Add support for one time backup

[johscheuer]

Description

Add support for one time backup. The default is still to start a continuous backup, but in some cases it might be helpful to start a one time backup.

Type of change

• New feature (non-breaking change which adds functionality)

Discussion

I restructured our e2e backup test cases a bit.

Testing

Ran the backup e2e test cases.

Documentation

Updated.

Follow-up

Nothing.

[foundationdb-ci]

Result of fdb-kubernetes-operator-pr on Linux RHEL 9

• Commit ID: 5457a2e
• Duration 2:47:16
• Result: ❌ FAILED
• Error: Error while executing command: if $fail_test; then exit 1; fi. Reason: exit status 1
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[foundationdb-ci]

Result of fdb-kubernetes-operator-pr on Linux RHEL 9

• Commit ID: 5457a2e
• Duration 1:46:19
• Result: ❌ FAILED
• Error: Error while executing command: if $fail_test; then exit 1; fi. Reason: exit status 1
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[foundationdb-ci]

Result of fdb-kubernetes-operator-pr on Linux RHEL 9

• Commit ID: 5457a2e
• Duration 2:02:21
• Result: ✅ SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[nicmorales9]

just nits and non-blocking questions, lgtm

[foundationdb-ci]

Result of fdb-kubernetes-operator-pr on Linux RHEL 9

• Commit ID: 960edc2
• Duration 2:18:59
• Result: ✅ SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)