Add the FinOps Database Resources tab to the web viewer (#4843)

[erikdarlingdata]

The web viewer's FinOps Database Resources tab now shows a table over get_finops view=database_resources (hours 24).

• Rows: every database the read returns, up to 500, ordered by CPU, then I/O, then name. The notice says when there were more.
• Columns: the 11 columns in the desktop grid's order (FinOpsTab.xaml): database, CPU, CPU %, logical reads, physical reads, logical writes, executions, I/O read MB, I/O write MB, I/O %, I/O stall. CPU and I/O stall use the ms format. Every key is one the view's rows entries emit.
• No bands: the browser derives no band, colour or threshold.
• Off this tab: the top lists, which belong to the Utilization tab.

The notice is built from the answer:

• normally N databases, last H hours., or "1 database" for one;
• when truncated is true, …; the top N of {database_count} databases by CPU, then I/O.

Empty, not-collected, error and aborted/auth states match the High Impact tab.

Remaining: the desktop's 1/4/12/24/168 h window picker. The web tab uses a fixed 24 h, and the notice states it.

Tests: a new class, FinOpsTabDatabaseResourcesPageTests, with 10 facts:

• every shown column key is matched inside the DatabaseResourcesRow object only, and the count equals its 11 properties;
• the full column order is pinned exactly;
• the notice expressions are pinned exactly;
• the exact read call is pinned. That last pin is a no-noise guard: a limit would cap only the top lists, which this tab doesn't show.

Verified at the head:

• Builds: Darling.Tests and Lite.Tests build with 0 errors. The one Darling.Tests warning, CA1068, is in a file this PR doesn't touch, and dev has it too.
• Classes: these pass:
  • FinOpsTabDatabaseResourcesPageTests 10/10
  • FinOpsDatabaseResourcesViewTests 3/3
  • FinOpsPageShellTests 23/23
  • ServerPageTabsTests 19/19
  • FinOpsTabHighImpactPageTests 7/7
  • the guards
• REDs:
  • Against the stub, all but the import fact fail.
  • A column bound to avg_cpu_ms, a key only the top lists carry, fails the key pin and the order pin.
  • Swapping the shown count and the total in the notice fails the notice pin.

Refs #4843

SECTION: Added
ENTRY: - The web viewer's FinOps page gains the Database Resources tab ([#5041]) - per-database CPU, reads, writes, executions and file I/O for the server over the last 24 hours, with each database's share of the server's CPU and I/O, read from get_finops
REF: [#5041]: #5041