Removing a timeseries from timeseries group errors with large groups

Describe the bug
In CWMS-Vue using CDA for cwbi-test user removes a single timeseries from a large timeseries group (>1,000). The behavior uses replace-assigned-ts=true so it will delete all timeseries in the group and then reload then. With such a large timeseries group this is causing an error.

https://discourse.hecdev.net/t/v4-2-0-09-beta-cannot-unassign-time-series-from-time-series-group/4574

Expected behavior
We should have the behavior to remove a timeseries or subset of timeseries to just remove those timeseries and not have to do a replace-assigned-ts. Have a remove-ts or something like that. json would old the ones to remove and then it would just remove those.

To Reproduce
In CWMS-Vue for LRL. try to remove a timeseries group from the Data Acquisition-> SHEF timeseries group. Have not tested if this is the same from CDA directly.

Logs/Incident Identifier
08:41:01 INFO: Committing manager: Time Series Groups
08:41:03 WARNING: Error removing time series group SHEF Data Acquisition from database.
java.util.concurrent.CompletionException: hec.db.DbRuntimeException: hec.db.DbIoException: mil.army.usace.hec.cwms.http.client.CwmsHttpResponseException: Unknown error occurred for request: PATCH https://cwms-data-test.cwbi.us/cwms-data/timeseries/group/SHEF%20Data%20Acquisition?replace-assigned-ts=true&office=CWMS
Error code: 400 Bad Request

<title>400 Bad Request</title>

Bad Request

Your browser sent a request that this server could not understand.

    at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:315)
    at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:320)
    at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:649)
    at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
    at java.base/java.lang.Thread.run(Thread.java:1583)

Caused by: hec.db.DbRuntimeException: hec.db.DbIoException: mil.army.usace.hec.cwms.http.client.CwmsHttpResponseException: Unknown error occurred for request: PATCH https://cwms-data-test.cwbi.us/cwms-data/timeseries/group/SHEF%20Data%20Acquisition?replace-assigned-ts=true&office=CWMS

Start with the PATCH /timeseries/group/{group}?replace-assigned-ts=true request shown in the logs and review the linked reproduction context. Trace how assigned time series are removed for large groups, then add coverage for removing a subset without replacing the entire assignment and verify the request succeeds for groups over 1,000 entries.