Rename some S3 usages to "remote storage" in exposed messages

[arpad-m]

In exposed messages like log messages we mentioned "S3", which is not entirely accurate as we support Azure blob storage now as well.

[orca-security-us]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

[github-actions]

4968 tests run: 4804 passed, 0 failed, 164 skipped (full report)

---

Flaky tests (6)

Postgres 17

• test_subscriber_restart: debug-x86-64

Postgres 16

• test_scrubber_physical_gc[4]: release-arm64
• test_wal_restore: release-arm64
• test_wal_restore_initdb: release-arm64

Postgres 15

• test_subscriber_restart: release-x86-64

Postgres 14

• test_scrubber_physical_gc[4]: release-arm64

Code coverage* (full report)

• functions: 31.8% (7415 of 23294 functions)
• lines: 49.9% (59570 of 119380 lines)

* collected from Rust tests only

---

_{The comment gets automatically updated with the latest test results
510b3cd at 2024-09-13T11:46:19.679Z :recycle:}