Identify .pubxml as XML

[ultraslayyy]

Description

Checklist:

• I am adding a new extension to a language.
  • The new extension is used in hundreds of repositories on GitHub.com
    • Search results for each extension:
      • https://github.com/search?q=path%3A*.pubxml+NOT+is%3Afork&type=code&ref=advsearch
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • https://github.com/ultraslayyy/I-am-bored/blob/info/notepad%23/src/Properties/PublishProfiles/Win64.pubxml
    • Sample license(s): GNU GPL v3.0

[lildude]

I have included a real-world usage sample for all extensions added in this PR:

* Sample source(s):
  
  * https://github.com/ultraslayyy/I-am-bored/blob/info/notepad%23/src/Properties/PublishProfiles/Win64.pubxml (I couldn't find an official Microsoft file on GitHub for this, so I used my own)

You need to add it to the relevant samples directory in this repo.

Any example with an open source license will do.

[ultraslayyy]

Ok I have done that :)

[lildude]

• https://github.com/ultraslayyy/linguist/blob/main/samples/XML/Win64.pubxml

A link to your fork of this repo is not the original source. Please update this link to the original source of the sample and state the license (you've deleted the license point from the template).

[ultraslayyy]

I think I fixed it. I'm sorry if I haven't, my brain just isn't at 100% rn :)

[lildude]

Ooops. I forgot the XML strategy test needs modification too.

You can fix the failing test by adding the sample path to the array in the test:

linguist/test/test_strategies.rb

Lines 176 to 195 in 2409807

	def test_xml
	no_root_tag = [
	"#{samples_path}/XML/libsomething.dll.config",
	"#{samples_path}/XML/real-estate.mjml",
	"#{samples_path}/XML/XmlIO.pluginspec",
	"#{samples_path}/XML/MainView.ux",
	"#{samples_path}/XML/MyApp.ux",
	"#{samples_path}/XML/xhtml-struct-1.mod",
	"#{samples_path}/XML/wixdemo.wixproj",
	"#{samples_path}/XML/msbuild-example.proj",
	"#{samples_path}/XML/sample.targets",
	"#{samples_path}/XML/Default.props",
	"#{samples_path}/XML/racoon.mjml",
	"#{samples_path}/XML/route-gas-works-lake-union-loop.gpx",
	"#{samples_path}/XML/some-ideas.mm",
	"#{samples_path}/XML/GMOculus.project.gmx",
	"#{samples_path}/XML/obj_control.object.gmx",
	"#{samples_path}/XML/MainView.axaml",
	"#{samples_path}/XML/Robots.slnx",
	]