K8SPXC-1679: add prefix and checksumAlgorithm to s3 storages

[pooknull]

https://perconadev.atlassian.net/browse/K8SPXC-1679

DESCRIPTION

This PR adds prefix and checksumAlgorithm fields to the S3 backup storages.

prefix - lets define the object path separately from the bucket name. If bucket already contains a path (for example bucket: operator-testing/prefix with prefix: subfolder), the operator appends the prefix to the end of bucket path (operator-testing/prefix/subfolder).

checksumAlgorithm - lets users choose the checksum (https://docs.aws.amazon.com/AmazonS3/latest/userguide/checking-object-integrity-upload.html#using-additional-checksums) used for S3 uploads. In practice it is mainly used only for PITR collector since xbcloud doesn't support checksums.

CHECKLIST

Jira

• Is the Jira ticket created and referenced properly?
• Does the Jira ticket have the proper statuses for documentation (Needs Doc) and QA (Needs QA)?
• Does the Jira ticket link to the proper milestone (Fix Version field)?

Tests

• Is an E2E test/test case added for the new feature/change?
• Are unit tests added where appropriate?
• Are OpenShift compare files changed for E2E tests (compare/*-oc.yml)?

Config/Logging/Testability

• Are all needed new/changed options added to default YAML files?
• Are all needed new/changed options added to the Helm Chart?
• Did we add proper logging messages for operator actions?
• Did we ensure compatibility with the previous version or cluster upgrade process?
• Does the change support oldest and newest supported PXC version?
• Does the change support oldest and newest supported Kubernetes version?

[JNKPercona]

Test Name	Result	Time
auto-tuning-8-0	passed	00:20:50
allocator-8-0	passed	00:13:45
allocator-8-4	passed	00:14:02
backup-storage-tls-8-0	passed	00:22:35
cross-site-8-0	passed	00:37:29
custom-users-8-0	passed	00:12:27
demand-backup-cloud-8-0	passed	01:01:57
demand-backup-cloud-8-4	passed	01:02:14
demand-backup-cloud-pxb-8-0	passed	00:56:56
demand-backup-encrypted-with-tls-5-7	passed	00:49:16
demand-backup-encrypted-with-tls-8-0	passed	00:47:37
demand-backup-encrypted-with-tls-8-4	passed	00:48:41
demand-backup-encrypted-with-tls-pxb-5-7	passed	00:19:07
demand-backup-encrypted-with-tls-pxb-8-0	passed	00:18:18
demand-backup-encrypted-with-tls-pxb-8-4	passed	00:18:53
demand-backup-8-0	failure	00:36:07
demand-backup-flow-control-8-0	passed	00:11:30
demand-backup-flow-control-8-4	passed	00:11:23
demand-backup-parallel-8-0	passed	00:09:46
demand-backup-parallel-8-4	passed	00:10:18
demand-backup-without-passwords-8-0	passed	00:16:43
demand-backup-without-passwords-8-4	passed	00:16:57
extra-pvc-8-0	passed	00:25:30
haproxy-5-7	passed	00:15:22
haproxy-8-0	passed	00:15:16
haproxy-8-4	passed	00:15:14
init-deploy-5-7	passed	00:17:14
init-deploy-8-0	passed	00:18:43
limits-8-0	passed	00:12:52
monitoring-2-0-8-0	passed	00:24:37
monitoring-pmm3-8-0	passed	00:19:59
monitoring-pmm3-8-4	passed	00:20:56
one-pod-5-7	passed	00:15:09
one-pod-8-0	passed	00:14:11
pitr-8-0	passed	00:48:21
pitr-8-4	passed	00:48:13
pitr-pxb-8-0	passed	00:47:01
pitr-pxb-8-4	passed	00:48:34
pitr-gap-errors-8-0	passed	00:51:05
pitr-gap-errors-8-4	passed	00:51:14
proxy-protocol-8-0	passed	00:09:49
proxy-switch-8-0	passed	00:14:36
proxysql-sidecar-res-limits-8-0	passed	00:09:08
proxysql-scheduler-8-0	failure	00:16:01
pvc-resize-5-7	passed	00:18:07
pvc-resize-8-0	passed	00:18:31
recreate-8-0	passed	00:19:05
restore-to-encrypted-cluster-8-0	passed	00:27:09
restore-to-encrypted-cluster-8-4	passed	00:27:30
restore-to-encrypted-cluster-pxb-8-0	passed	00:16:41
restore-to-encrypted-cluster-pxb-8-4	passed	00:16:47
scaling-proxysql-8-0	passed	00:09:00
scaling-8-0	passed	00:10:57
scheduled-backup-5-7	passed	01:09:36
scheduled-backup-8-0	passed	01:05:00
scheduled-backup-8-4	passed	01:08:25
security-context-8-0	passed	00:26:29
smart-update1-8-0	passed	00:33:43
smart-update1-8-4	passed	00:34:36
smart-update2-8-0	passed	00:39:32
smart-update2-8-4	passed	00:40:20
smart-update3-8-0	passed	00:17:23
storage-8-0	passed	00:11:07
tls-issue-cert-manager-ref-8-0	passed	00:09:14
tls-issue-cert-manager-8-0	passed	00:10:22
tls-issue-self-8-0	passed	00:14:23
upgrade-consistency-8-0	passed	00:12:25
upgrade-consistency-8-4	passed	00:12:13
upgrade-haproxy-5-7	passed	00:27:08
upgrade-haproxy-8-0	passed	00:27:10
upgrade-proxysql-5-7	passed	00:15:35
upgrade-proxysql-8-0	passed	00:16:03
users-5-7	failure	00:00:48
users-8-0	failure	00:00:11
users-scheduler-8-4	failure	00:00:47
validation-hook-8-0	passed	00:01:49

Summary	Value
Tests Run	76/76
Job Duration	04:11:52
Total Test Time	31:34:38

commit: 13dc5c0
image: perconalab/percona-xtradb-cluster-operator:PR-2382-13dc5c0a