OTLP File exporter may crash if create thread failed

[owent]

Describe your environment

OS: Linux

Steps to reproduce
We have a internal prometheus file exporter which just like OTLP file exporter, and it may lead to crash when creating thread failed.
I think there is simular problem in OTLP file exporters.

Additional context

(gdb) bt
#0  0x00007f2882895387 in raise () from /lib64/libc.so.6
#1  0x00007f2882896a78 in abort () from /lib64/libc.so.6
#2  0x00007f2882f90a95 in __gnu_cxx::__verbose_terminate_handler() () from /lib64/libstdc++.so.6
#3  0x00007f2882f8ea06 in ?? () from /lib64/libstdc++.so.6
#4  0x00007f2882f8d9b9 in ?? () from /lib64/libstdc++.so.6
#5  0x00007f2882f8e624 in __gxx_personality_v0 () from /lib64/libstdc++.so.6
#6  0x00007f288ad2b8e3 in ?? () from /lib64/libgcc_s.so.1
#7  0x00007f288ad2be17 in _Unwind_Resume () from /lib64/libgcc_s.so.1
#8  0x00007f288f69f226 in rpc::telemetry::exporter::metrics::PrometheusFileBackend::AddMetricData (this=<optimized out>, data=...)
    at /data/devops/workspace/p-4943d876cb734a609b55ad5c740c36ff/src/pool/0/server/main/src/server_frame/rpc/telemetry/exporter/prometheus_file_exporter.cpp:636
#9  0x00007f288f69bdbd in rpc::telemetry::exporter::metrics::PrometheusFileExporter::Export (this=<optimized out>, data=...)
    at /data/devops/workspace/p-4943d876cb734a609b55ad5c740c36ff/src/pool/0/server/main/src/server_frame/rpc/telemetry/exporter/prometheus_file_exporter.cpp:1028

PrometheusFileBackend::AddMetricData calls SpawnBackgroundWorkThread() and the implementation just like OtlpFileSystemBackend::SpawnBackgroundWorkThread().

[malkia]

I wonder what's the reason behind catch (...) here: https://github.com/search?q=repo%3Aopen-telemetry%2Fopentelemetry-cpp+%22catch+%28...%29%22+language%3AC%2B%2B&type=code (one example, and another related to this code).

[owent]

I wonder what's the reason behind catch (...) here: https://github.com/search?q=repo%3Aopen-telemetry%2Fopentelemetry-cpp+%22catch+%28...%29%22+language%3AC%2B%2B&type=code (one example, and another related to this code).

This file is not always included, depends on whether to use external abseil-cpp libraries.