[HOLD for payment July 22] Update line break regex for HTML->Markdown to support break tags with styles

[Jag96]

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More context in #4009 (comment), this is part of #3047, @parasharrajat will handle as a follow-up

Action Performed:

1. Copy the following text:

Bold text
italic text
Strikethrough text

2. Paste the text in e.cash

Expected Result:

Line breaks should be included in the pasted message

Actual Result:

Line breaks aren't included in the pasted message

Workaround:

The user has to manually insert line breaks

Platform:

Web

Version Number: 1.0.77-6

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[parasharrajat]

1. It is straightforward like we did for Italic.
   <br(?:"[^"]*"|'[^']*'|[^'">])*>(?![^<]*(<\/pre>|<\/code>))\n?

We need to exclude pre and code tags and Allow any attribute between start tags, with one exception there is no end tag here.

[isagoico]

Let us know when #3047 is fixed so we can retest this PR :)

[Jag96]

We're going to be doing #3047 in pieces, so #4009 is the latest PR (on staging) to test for this!

[Jag96]

Paid!