Improve REST query naming in navigation

[aptkingston]

Description

This PR updates the displayed names of REST queries in the navigation.
Described in #4175.

Behaviour

• Protocol is trimmed
• Double leading slash is trimmed
• Trailing slash is trimmed
• Domain is trimmed if path exists
• Domain is shown if no path exists

Example of REST datasource:

Examples of new naming

Query URL	Displayed URL
foo.bar	foo.bar
foo.bar/	foo.bar
/foo/bar	/foo/bar
//foo.bar	foo.bar
//foo.bar/baz/	/baz
http://foo.bar	foo.bar
http://foo.bar/	foo.bar
http://foo.bar/baz	/baz
{{variable}}/foo/bar/	/foo/bar
{{variable}}	{{variable}}
/{{variable}}	/{{variable}}
http://foo.{{variable}}.bar/foo/bar/	/foo/bar
https://{{subdomain}}.{{domain}}.com/{{foo}}/bar/{{baz}}/	/{{foo}}/bar/{{baz}}

[codecov-commenter]

Codecov Report

Merging #4700 (4304205) into develop (f37a4ee) will not change coverage.
The diff coverage is n/a.

❗ Current head 4304205 differs from pull request most recent head 02c6885. Consider uploading reports for the commit 02c6885 to get more accurate results

@@           Coverage Diff            @@
##           develop    #4700   +/-   ##
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  Coverage    67.91%   67.91%           
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  Files          144      144           
  Lines         4922     4922           
  Branches       761      761           
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  Hits          3343     3343           
  Misses        1105     1105           
  Partials       474      474           

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[Rory-Powell]

Great to see the example usage of this in the pr description. Could we add unit tests for this function?

[aptkingston]

Good call actually, it's a perfect candidate. Will add some in.

[aptkingston]

Never mind actually - I forgot that we nuked jest from the builder since it was so horribly broken. This is just something we'll need to remember to add in once we've got a working jest setup again.

[shogunpurple]

LGTM! URLs look super clean - love the way it accounts for all different configurations.