Add Fork/Cancel confirmation to "Replace"/"Delete" buttons

What does this MR do?

• Add Fork/Cancel confirmation to "Replace"/"Delete" buttons (see blob:show, blame:show)

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Previously when needing to fork, clicking on "Replace"/"Delete" would fork immediately. This is inconsistent with what we decided to move to with the "Edit" button that has a verification Fork/Cancel button combo , https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10233

Does this MR meet the acceptance criteria?

• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #30637 (closed)

changed title from Resolve "Behavior of "Replace" and "Delete" buttons on blob page is inconsistent with "Edit" button" to Add Fork/Cancel confirmation to "Replace"/"Delete" buttons

marked the task Added for this feature/bug as completed

added 1 commit

• dbd1ae37 - Add Fork/Cancel confirmation to "Replace"/"Delete" buttons

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assigned to @MadLittleMods

added 61 commits

• dbd1ae37...069c54a7 - 59 commits from branch master
• 40ce3819 - Fix edit button on blame page without repo perms
• ae455195 - Add Fork/Cancel confirmation to "Replace"/"Delete" buttons

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assigned to @DouweM

added 30 commits

• 4865c442...a62ae94d - 29 commits from branch master
• bc58db60 - Add Fork/Cancel confirmation to "Replace"/"Delete" buttons

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added 30 commits

• 4865c442...a62ae94d - 29 commits from branch master
• bc58db60 - Add Fork/Cancel confirmation to "Replace"/"Delete" buttons

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@MadLittleMods Code looks good, just one last discussion to resolve!

assigned to @MadLittleMods

marked the task All builds are passing as completed

added 1 commit

• d571093b - Add Fork/Cancel confirmation to "Replace"/"Delete" buttons

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assigned to @filipa

resolved all discussions

Thank you @MadLittleMods. Left just 3 small comments :)

assigned to @MadLittleMods

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assigned to @filipa

@MadLittleMods I am a little confused. Why did we transform this into a class? Won't a function be enough?

I honestly think a function is all we need 😊

@fatihacet can you please help me review this? Thanks :)

assigned to @fatihacet

@fatihacet Friendly ping for review

added 441 commits

• d94885a4...60a6389a - 440 commits from branch master
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@MadLittleMods added some minor comments.

assigned to @MadLittleMods

added 1 commit

• 3e55bb7c - Add Fork/Cancel confirmation to "Replace"/"Delete" buttons

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• 0bebd8ee - 1 commit from branch master

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assigned to @filipa

added 1 commit

• 36387ce1 - Add Fork/Cancel confirmation to "Replace"/"Delete" buttons

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