fix: accept case-insensitive HTTPS schemes in Thrift connections

[Shubham-Padkonde]

What type of PR is this?

• Bug Fix

Description

An explicit HTTPS:// or mixed-case HtTpS:// prefix in server_hostname is currently prefixed again with https://. The Thrift transport then parses https as the hostname instead of the workspace hostname.

Check the HTTPS prefix case-insensitively while preserving the original URI. Added transport-level regression coverage for uppercase and mixed-case schemes, with lowercase and scheme-less controls, checking the resulting hostname, port, and path.

This addresses the Thrift backend portion of #950. The separately reported Rust kernel behavior is outside this change.

How is this tested?

• Unit tests
• E2E Tests

Windows / Python 3.13:

• Uppercase and mixed-case regression subcases fail on the original implementation; the lowercase and scheme-less controls pass.
• python -m pytest tests/unit/test_thrift_backend.py -q: 71 passed, 87 subtests passed.
• python -m pytest tests/unit -m "not realkernel" -q: 1,018 passed, 5 skipped, 1 deselected, 359 subtests passed (11 warnings).
• Black checks on both changed files and git diff --check pass.

No live Databricks workspace or optional Rust kernel tests were run.

Related Tickets & Documents

Related to #950 (Thrift portion).

Prepared with Codex assistance. The contributor personally reviewed and signed off the commit.

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