storcon: add tags to scheduler logs

[VladLazar]

We log something at info level each time we schedule a shard to a non-secondary location.
Might as well have context for it.

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.
• Do we need to implement analytics? if so did you add the relevant metrics to the dashboard?
• If this PR requires public announcement, mark it with /release-notes label and add several sentences in this section.

Checklist before merging

• Do not forget to reformat commit message to not include the above checklist

[yliang412]

LGTM. Is there any place that already logged these info not as a span? We might want to remove them.

[VladLazar]

LGTM. Is there any place that already logged these info not as a span? We might want to remove them.

Did a quick spot check and doesn't seem to be the case.

[github-actions]

5012 tests run: 4848 passed, 0 failed, 164 skipped (full report)

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Flaky tests (5)

Postgres 17

• test_readonly_node_gc: debug-x86-64

Postgres 15

• test_ondemand_wal_download_in_replication_slot_funcs: release-x86-64

Postgres 14

• test_hot_standby_gc[True]: release-x86-64
• test_multi_attach: release-x86-64
• test_subscriber_restart: release-x86-64

Code coverage* (full report)

• functions: 32.1% (7468 of 23243 functions)
• lines: 50.0% (60190 of 120494 lines)

* collected from Rust tests only

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_{The comment gets automatically updated with the latest test results
e4a3382 at 2024-09-24T17:59:58.188Z :recycle:}