fix: Fix pattern for replacing OPENVSX_URL variable

[RomanNikitenko]

What does this PR do?

Fixes pattern for replacing OPENVSX_URL variable in the /checode/checode-linux-libc/out/vs/workbench/workbench.web.main.js file.
The pattern is used in the entrypoint, see here.

Before this change the pattern broke the corresponding product configuration - it cut all values of the product.json file which were placed after the serviceUrl and itemUrl fields.

What issues does this PR fix?

eclipse-che/che#21962
https://issues.redhat.com/browse/CRW-4114

How to test this PR?

I tested it in the downstream:

• start a workspace
• open /checode/checode-linux-libc/out/vs/workbench/workbench.web.main.js file
• search extensionsGallery:
• check that all fields of the product.json file are present in the file

The pattern should also handle correctly extra fields in the extensionGalary, for example:

"extensionsGallery": {
    "serviceUrl": "https://open-vsx.org/vscode/gallery",
    "itemUrl": "https://open-vsx.org/vscode/item",
    "resourceUrlTemplate": "someResourceUrlTemplate"
  },

[github-actions]

Click here to review and test in web IDE:

[github-actions]

Pull Request images published ✨
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Dev image: quay.io/che-incubator-pull-requests/che-code-dev:pr-219-dev-amd64

[github-actions]

Pull Request images published ✨
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Dev image: quay.io/che-incubator-pull-requests/che-code-dev:pr-219-dev-amd64

[github-actions]

Pull Request images published ✨
image: quay.io/che-incubator-pull-requests/che-code:pr-219-amd64
Dev image: quay.io/che-incubator-pull-requests/che-code-dev:pr-219-dev-amd64

[github-actions]

Pull Request images published ✨
image: quay.io/che-incubator-pull-requests/che-code:pr-219-amd64
Dev image: quay.io/che-incubator-pull-requests/che-code-dev:pr-219-dev-amd64

[azatsarynnyy]

Nice catch 👍

[devstudio-release]

Build 3.7 :: code_3.x/647: Console, Changes, Git Data

[devstudio-release]

Build 3.7 :: sync-to-downstream_3.x/3381: Console, Changes, Git Data

[devstudio-release]

Build 3.7 :: get-sources-rhpkg-container-build_3.x/3179: Console, Changes, Git Data

[devstudio-release]

Build 3.7 :: get-sources-rhpkg-container-build_3.x/3179:

code : 3.x ::
; copied to quay