fix: ShowItemUsingFileManager should escape path in Linux

[hsfzxjy]

Description of Change

According to https://edeproject.org/spec/file-uri-spec.txt , strings passed to org.freedesktop.FileManager1.ShowItems are regarded as escaped file paths:

The specification for file: URIs, RFC2396[1] and RFC1738[2] says that
file URIs are of the form:
file://<hostname>/<path>

Where the hostname and path parts can contain a limited subset of
ASCII characters, representing their ASCII values, and any other bytes
escaped by using a % followed by a two digit hex value. As a special
case the hostname part can be "localhost" or empty meaning the machine
the URI is being interpreted on.

Hence, we should escape the file path passed in before sending it to dbus.

This will fix microsoft/vscode#198045 .

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• tests are changed or added
• relevant documentation, tutorials, templates and examples are changed or added
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: Fixed file paths passed to shell.showItemInFolder not being escaped in Linux.

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[codebytere]

Thanks!

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Congrats on merging your first pull request! 🎉🎉🎉

[release-clerk]

Release Notes Persisted

Fixed file paths passed to shell.showItemInFolder not being escaped in Linux.

[trop]

I have automatically backported this PR to "26-x-y", please check out #40560

[trop]

I have automatically backported this PR to "27-x-y", please check out #40561

[trop]

I have automatically backported this PR to "28-x-y", please check out #40562