supabase / supabase-flutter / 28649233599

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feat(storage): add upsert option to createSignedUploadUrl (#1515)

## What

`createSignedUploadUrl` now accepts an optional `upsert` flag (default
`false`). When `true`, the request sends the `x-upsert: true` header so
the resulting signed upload URL can overwrite an existing file at that
path.

## Why

SDK parity: supabase-js `createSignedUploadUrl(path, { upsert })`
supports this; the Dart client always created a non-upsert URL.

## Tests

- Mock-based unit tests assert the `x-upsert` header is omitted by
default and set to `true` when upserting.
- An end-to-end test uploads a file, then uses an upsert signed upload
URL to actually overwrite it (contrasting with the existing non-upsert
409 case).

## Compliance

Marks `create_signed_upload_url` implemented in `sdk-compliance.yaml`.

Resolves SDK-1167

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