Send X-Scal-Request-Uids (not x-scal-request-id) on the management config poll

[delthas]

The management config-overlay poll (lib/management/poll.js,
loadRemoteOverlay) sent the werelogs req_id chain under the wrong
header name x-scal-request-id. Rename the outgoing header to
x-scal-request-uids, which matches cloudserver's own reader in
lib/server.js. The value (log.getSerializedUids()) is unchanged.

Pure rename: no dual-send. Also exports loadRemoteOverlay and adds a
focused unit test asserting the outgoing request carries
x-scal-request-uids and not x-scal-request-id.

Issue: CLDSRV-948

[bert-e]

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[bert-e]

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[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
9661	1	9660	0

View the full list of 2 ❄️ flaky test(s)

"after each" hook for "should fail if trying to overwrite a delete marker"::MPU with x-scal-s3-version-id header With v4 signature "after each" hook for "should fail if trying to overwrite a delete marker"

Flake rate in main: 100.00% (Passed 0 times, Failed 206 times)

Stack Traces | 0.017s run time

We encountered an internal error. Please try again.

should create a bunch of objects and their versions::put and head object with versioning With v4 signature on versioning suspended then enabled bucket w/ null version should create a bunch of objects and their versions

Flake rate in main: 13.81% (Passed 668 times, Failed 107 times)

Stack Traces | 600s run time

Timeout of 600000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (.../test/versioning/objectHead.js)

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