[openstreetmap/openstreetmap-website] Compress GPX traces when saving (Issue #4188)

[Grant]

### Problem

The source GPX traces are currently saved uncompressed in AWS S3 via Active Storage

We currently spend ~ $124 per month on storage and transfer-out (in is free) for GPX traces.


### Description

We should compress GPX files when saving them in S3.

We would save 60%+ in fees if we GZIP'ed the files.

### Screenshots

_No response_

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