Event handler loop fails on large database events using Athena audit backend

[greedy52]

Expected behavior:
Oversize database events should be trimmed to 1 MiB

Current behavior:

ERRO   Error ingesting Audit Log err:rpc error: code = Unknown desc = db.session.postgres.statements.parse event e3c6ff72-3085-4d6f-8248-20aee63b38f4 is 1.1 MiB and cannot be returned because it exceeds the maximum response size of 1.0 MiB event-handler/events_job.go:96
ERRO   Watcher event loop failed error:[
ERROR REPORT:
Original Error: *status.Error rpc error: code = Unknown desc = db.session.postgres.statements.parse event e3c6ff72-3085-4d6f-8248-20aee63b38f4 is 1.1 MiB and cannot be returned because it exceeds the maximum response size of 1.0 MiB
Stack Trace:
    /go/pkg/mod/github.com/gravitational/teleport/api@v0.0.0-20231229230854-390d33c42bbe/client/client.go:2208 github.com/gravitational/teleport/api/client.(*Client).SearchUnstructuredEvents
    /workspace/event-handler/teleport_events_watcher.go:225 main.(*TeleportEventsWatcher).getEvents
    /workspace/event-handler/teleport_events_watcher.go:153 main.(*TeleportEventsWatcher).fetch
    /workspace/event-handler/teleport_events_watcher.go:262 main.(*TeleportEventsWatcher).Events.func1
    /usr/local/go/src/runtime/asm_amd64.s:1650 runtime.goexit
User Message: rpc error: code = Unknown desc = db.session.postgres.statements.parse event e3c6ff72-3085-4d6f-8248-20aee63b38f4 is 1.1 MiB and cannot be returned because it exceeds the maximum response size of 1.0 MiB] event-handler/events_job.go:81
ERRO   Terminating with fatal error [1]... error:[
ERROR REPORT:
Original Error: *status.Error rpc error: code = Unknown desc = db.session.postgres.statements.parse event e3c6ff72-3085-4d6f-8248-20aee63b38f4 is 1.1 MiB and cannot be returned because it exceeds the maximum response size of 1.0 MiB
Stack Trace:
    /go/pkg/mod/github.com/gravitational/teleport/api@v0.0.0-20231229230854-390d33c42bbe/client/client.go:2208 github.com/gravitational/teleport/api/client.(*Client).SearchUnstructuredEvents
    /workspace/event-handler/teleport_events_watcher.go:225 main.(*TeleportEventsWatcher).getEvents
    /workspace/event-handler/teleport_events_watcher.go:153 main.(*TeleportEventsWatcher).fetch
    /workspace/event-handler/teleport_events_watcher.go:262 main.(*TeleportEventsWatcher).Events.func1
    /usr/local/go/src/runtime/asm_amd64.s:1650 runtime.goexit
User Message: rpc error: code = Unknown desc = db.session.postgres.statements.parse event e3c6ff72-3085-4d6f-8248-20aee63b38f4 is 1.1 MiB and cannot be returned because it exceeds the maximum response size of 1.0 MiB] lib/bail.go:28

Bug details:

• Teleport version: v14

#35402 already implements trimming of large events in Athena querier. However, not all database events implements TrimToMaxSize.