Fix TypeError when popover/tooltip title or content is "true"/"false"

[Copilot]

normalizeData in manipulator.js coerces the strings "true"/"false" from data attributes into booleans, but title and content config options only accept string|element|function|null — causing a TypeError on type check.

Changes:

• js/src/tooltip.js — Extended _configAfterMerge to convert boolean title/content values to their string representations, mirroring the existing number-to-string handling
• js/tests/unit/tooltip.spec.js — Added test case alongside the existing numeric conversion test

<!-- Previously threw TypeError, now renders "true" as content -->
<button data-bs-toggle="popover" data-bs-content="true">Show "true"</button>

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Popover] data-bs-content="true"/"false" auto-converted to boolean causes TypeError, but "true"/"false" are valid string content.</issue_title>
<issue_description>### Prerequisites

• I have searched for duplicate or closed issues
• I have validated any HTML to avoid common problems
• I have read the contributing guidelines

Describe the issue

When using data-bs-content="true" (or "false") on an element with data-bs-toggle="popover", Bootstrap internally converts the string "true" to the boolean true, causing _typeCheckConfig to throw:

TypeError: POPOVER: Option "content" provided type "boolean" but expected type "(null|string|element|function)".

This prevents users from displaying the literal string "true" or "false" — a common and valid use case (e.g., showing boolean-like values in tables, configs, JSON previews).

Reduced test cases

1. Add this HTML:
   <button type="button" class="btn btn-secondary" data-bs-toggle="popover" data-bs-content="true"> Show "true" </button>

2. Initialize popovers (e.g., via new bootstrap.Popover() or auto-init via data-bs-toggle).

3. Observe console error:
   TypeError: POPOVER: Option "content" provided type "boolean" but expected type "(null|string|element|function)".

What operating system(s) are you seeing the problem on?

Windows

What browser(s) are you seeing the problem on?

Chrome

What version of Bootstrap are you using?

v5.2.1</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Popover] data-bs-content="true"/"false" auto-converted to boolean causes TypeError, but "true"/"false" are valid string content. #41925

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