style: suppress UP032 in helpers.py with block-level disable

ruff's --add-noqa injected # noqa: UP032 after the backslash line
continuation on two multi-line .format() strings in get_expiration_banner_text(),
corrupting the syntax (a comment cannot follow a line continuation character).

Rather than converting to f-strings, use ruff's block-level suppression
(# ruff: disable[UP032] / # ruff: enable[UP032]) which avoids the syntax
corruption and results in a smaller diff than an f-string rewrite.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: feanil

lms/djangoapps/courseware/tests/helpers.py

@@ -433,7 +433,8 @@ def get_expiration_banner_text(user, course, language='en'):  # lint-amnesty, py
     if upgrade_deadline:
         formatted_upgrade_deadline = strftime_localized_html(upgrade_deadline, 'SHORT_DATE')
 
-        bannerText = '<strong>Audit Access Expires {expiration_date}</strong><br>\  # noqa: UP032
+        # ruff: disable[UP032]
+        bannerText = '<strong>Audit Access Expires {expiration_date}</strong><br>\
                      You lose all access to this course, including your progress, on {expiration_date}.\
                      <br>Upgrade by {upgrade_deadline} to get unlimited access to the course as long as it exists\
                      on the site. <a id="FBE_banner" href="{upgrade_link}">Upgrade now<span class="sr-only"> to retain access past\
@@ -442,12 +443,15 @@ def get_expiration_banner_text(user, course, language='en'):  # lint-amnesty, py
             upgrade_link=upgrade_link,
             upgrade_deadline=formatted_upgrade_deadline
         )
+        # ruff: enable[UP032]
     else:
-        bannerText = '<strong>Audit Access Expires {expiration_date}</strong><br>\  # noqa: UP032
+        # ruff: disable[UP032]
+        bannerText = '<strong>Audit Access Expires {expiration_date}</strong><br>\
                      You lose all access to this course, including your progress, on {expiration_date}.\
                      '.format(
             expiration_date=formatted_expiration_date
         )
+        # ruff: enable[UP032]
     return bannerText