Remove namespace param from remaining manager calls

[awrichar]

Part of FIR-12
Follow-on to #864

This removes "namespace" as a param to remaining manager methods (since each manager is already assigned to a single namespace) and adds "namespace" as a param to most database queries (since all queries should be scoped to a single namespace).

[codecov-commenter]

Codecov Report

Merging #875 (5b55336) into main (2d0dbb9) will decrease coverage by 99.96%.
The diff coverage is n/a.

❗ Current head 5b55336 differs from pull request most recent head 43ed4a7. Consider uploading reports for the commit 43ed4a7 to get more accurate results

@@            Coverage Diff            @@
##             main   #875       +/-   ##
=========================================
- Coverage   99.96%      0   -99.97%     
=========================================
  Files         300      0      -300     
  Lines       19507      0    -19507     
=========================================
- Hits        19501      0    -19501     
+ Misses          5      0        -5     
+ Partials        1      0        -1     

Impacted Files	Coverage Δ
...ternal/apiserver/route_delete_contract_listener.go
internal/apiserver/route_delete_subscription.go
internal/apiserver/route_get_chart_histogram.go
...ternal/apiserver/route_get_contract_api_by_name.go
...rnal/apiserver/route_get_contract_api_interface.go
...rnal/apiserver/route_get_contract_api_listeners.go
internal/apiserver/route_get_contract_apis.go
...erver/route_get_contract_interface_name_version.go
...nternal/apiserver/route_get_contract_interfaces.go
...erver/route_get_contract_listener_by_name_or_id.go
... and 290 more

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