popovers: Rename and move popover-related templates to follow naming convention.

[sayamsamal]

Following our current naming convention, rename and move all popover-related templates to web/templates/popovers/*_popover.hbs.

Fixes: #29785 (comment)

Self-review checklist

• Self-reviewed the changes for clarity and maintainability
  (variable names, code reuse, readability, etc.).

Communicate decisions, questions, and potential concerns.

• Explains differences from previous plans (e.g., issue description).
• Highlights technical choices and bugs encountered.
• Calls out remaining decisions and concerns.
• Automated tests verify logic where appropriate.

Individual commits are ready for review (see commit discipline).

• Each commit is a coherent idea.
• Commit message(s) explain reasoning and motivation for changes.

Completed manual review and testing of the following:

• Visual appearance of the changes.
• Responsiveness and internationalization.
• Strings and tooltips.
• End-to-end functionality of buttons, interactions and flows.
• Corner cases, error conditions, and easily imagined bugs.

[sayamsamal]

@timabbott Here is the follow-up PR for #29785 (comment).

[timabbott]

Nice, merged, thanks @sayamsamal!