Fix #6430, #6431: Preserve worked example list spacing

[Neer-rn]

Explanation

Fixes #6430

Fixes #6431

Worked example lists were not parsed correctly when the list tags had extra attributes. Because of this, spaces between list items and paragraphs were missing. Some joined words were also shown as links.

This PR fixes the list parsing and adds tests for these cases.

Essential Checklist

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Disclosure of LLM Usage

• Did you use AI/LLMs when working on this PR? No

[github-actions]

Coverage Report

Results

Number of files assessed: 1
Overall Coverage: 0.00%
Coverage Analysis: PASS ✅

Exempted coverage

Files exempted from coverage

File	Exemption Reason
HtmlParser.kt utility/src/main/java/org/oppia/android/util/parser/html/HtmlParser.kt	This file is incompatible with code coverage tooling; skipping coverage check.

Refer test_file_exemptions.textproto for the comprehensive list of file exemptions and their required coverage percentages.

To learn more, visit the Oppia Android Code Coverage wiki page

[Neer-rn]

@adhiamboperes Please review and test this when you get time.

[adhiamboperes]

@Neer-rn, the regex looks good. I just need to test this manually.

[Neer-rn]

@adhiamboperes Please test this manually and let me know. If it doesn’t work as expected, I will need to make another revision.

[adhiamboperes]

The solution is in the right direction but there are some issues. First, the apperance of false links issue is fixed. It seems that some of the list item tags were being incorrectly stripped before, causing them to be appended to the end of the previous list items.

As for the list spacing:

Ordered List	Unordered list

In the answer contains ol, the spacing is correct.

But if ul:
The second question and answer is indented, while the bullet alignement is kept at the same level as the outer list.

[Neer-rn]

@adhiamboperes I have fixed the it. Please review this.

Before	After