[S3 OUTPUT] odd errors when workers are set

We're trying to get more throughput with our S3 output plugin as we noticed that, when using the rewrite_tag filter plugin (basically to split a single containers logs into X number of streams), that plugin is generating loads of _emitter files_ on disk and no amount of increasing the `upload_timeout` on the `S3` plugin seems to help. So we thought maybe using `workers` would work now as I know in the past the support wasn't there. We tried it and are getting odd results. Below are 2 different errors we see when setting `workers 2` that we don't see otherwise.

The emitter buffer directory seems to grow endlessly with thousands of very small files until our persistent volume runs out of space.

Error 1:
```
2025/07/09 22:08:05] [ info] [output:s3:s3.0] Successfully uploaded object /logs/application/cluster-integ-test/rate-limit-testing/web-container/hello-world/2025-07-09/stdout/220300-mETRinTB.gz
[2025/07/09 22:08:05] [ warn] [s3_key] Invalid Tag delimiter: does not exist in tag. tag=15613978119417515792-14826480349264227722, format=/logs/application/cluster-integ-test/$TAG[1]/$TAG[2]/$TAG[3]/%Y-%m-%d/$TAG[4]/%H%M%S-$UUID.gz
[2025/07/09 22:08:05] [ warn] [s3_key] Invalid / Out of bounds tag part: At most 10 tag parts ($TAG[0] - $TAG[9]) can be processed. tag=15613978119417515792-14826480349264227722, format=/logs/application/cluster-integ-test/$TAG[1]/$TAG[2]/$TAG[3]/%Y-%m-%d/$TAG[4]/%H%M%S-$UUID.gz, delimiters=.
[2025/07/09 22:08:05] [ info] [output:s3:s3.0] Successfully uploaded object /logs/application/cluster-integ-test/15613978119417515792-14826480349264227722[1]/15613978119417515792-14826480349264227722[2]/15613978119417515792-14826480349264227722[3]/2025-07-09/15613978119417515792-14826480349264227722[4]/220300-qOpanvDL.gz
[2025/07/09 22:08:05] [engine] caught signal (SIGSEGV)
#0 0x55af3d1b8d66 in cb_s3_flush() at plugins/out_s3/s3.c:2223
#1 0x55af3d6cd026 in co_init() at lib/monkey/deps/flb_libco/amd64.c:117
#2 0xffffffffffffffff in ???() at ???:0
```

Error 2:
```
[2025/07/09 22:09:07] [ info] [input:storage_backlog:storage_backlog.16] queueing emitter.17:1-1752097667.555759947.flb
[2025/07/09 22:09:07] [ info] [input:storage_backlog:storage_backlog.16] queueing emitter.17:1-1752097667.619441841.flb
#0 0x56005ab26fde in s3_store_file_delete() at plugins/out_s3/s3_store.c:424
#1 0x56005ab22a09 in upload_data() at plugins/out_s3/s3.c:1085
#2 0x56005ab24c86 in send_upload_request() at plugins/out_s3/s3.c:1662
#3 0x56005ab24dbf in s3_upload_queue() at plugins/out_s3/s3.c:1719
#4 0x56005ab25d66 in cb_s3_flush() at plugins/out_s3/s3.c:2223
#5 0x56005b03a026 in co_init() at lib/monkey/deps/flb_libco/amd64.c:117
#6 0xffffffffffffffff in ???() at ???:0
```

@edsiper @PettitWesley any ideas?