Use quoted @echo calls consistently in justfile

[nathanjmcdougall]

[ ] Add tests for the change. In general, aim for full test coverage at the Python level. Rust tests are optional.
[ ] Add any appropriate documentation.
[ ] Add a summary of changes to CHANGELOG.rst.
[ ] Add your name to AUTHORS.rst.
[ ] Run just full-check.

This is a follow-up to enabling Powershell support in #277.

Due to inconsistencies in shell behaviours with echo commands, the using unquoted echo is not properly supported by Powershell. It will pause and wait for user input:

cmdlet Write-Output at command pipeline position 1
Supply values for the following parameters:
InputObject[0]:

[codspeed-hq]

CodSpeed Performance Report

Merging #283 will not alter performance

_{Comparing nathanjmcdougall:fix/use-quoted-echo-calls (6c3fb81) with main (f397742)}

Summary

✅ 26 untouched
⏩ 23 skipped¹

Footnotes

1. 23 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩