Add Share Extension receipt telemetry: stamp trace id, log capture and submit milestones

[adhorodyski]

What

Extends the receipt capture-to-upload telemetry from Expensify#94950 to receipts that enter through the iOS Share Extension (print an email, Share, Expensify, Save).

Why

The trace id was minted in only two places: buildReceiptFiles.ts (camera, gallery, file) and replaceReceipt in Receipt.ts. The share flow goes through neither. It builds the receipt by hand in SubmitDetailsPage.onSuccess and calls requestMoney/trackExpense directly, so it also skips createTransaction, where the submitted milestone fires.

For a shared receipt this meant:

• No trace id, so we could not follow one receipt from capture to upload.
• The captured log never fired, so we lost mimeType, fileExtension, and fileSizeBytes. That is the PDF-format and large-file signal we care about.
• The submitted log never fired, so we lost the draft to final transactionID mapping.

Only enqueued and the queue snapshot still fired, both with receiptTraceId: undefined, joinable only by transactionID. This is the exact variant confirmed lost in production.

Changes

• Add 'share' to the ReceiptCaptureSource union in ReceiptObservability.ts.
• In SubmitDetailsPage.onSuccess, stamp the receipt with a trace id and log the capture milestone with captureSource: 'share'. The file read from disk carries its type, name, and size, so the capture log gets the format and size fields.
• In SubmitDetailsPage.finishRequestAndNavigate, log the submit milestone with the draft and final transaction ids right before the direct requestMoney/trackExpense call.

The stamp makes enqueued and snapshot carry a real trace id. The two log calls restore the captured and submitted milestones, so a shared receipt has the same end-to-end trace as a camera or gallery receipt.

Tests

Added a test in SubmitDetailsPageTest.tsx that drives a share submit and checks the trace id reaches the request receipt, and that the captured and submitted lines fire with source share. The existing ReceiptObservability unit tests already cover the shared helpers.

Related

• Fixes callstack-internal/expensify-issues#2690
• Parent: callstack-internal/expensify-issues#2685
• Builds on Add receipt capture-to-upload observability logging Expensify/App#94950

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[adhorodyski]

Reopening against Expensify/App instead. See the new PR.