### Link to issue number:

Fixes nvaccess#15591

 ### Summary of the issue:

Commit 62536a9
("soffice: Implement methods for status bar announcement (nvaccess#14933)")
added support for status bar announcement in LibreOffice by
searching for it in the a11y tree. For performance reasons,
only objects of specific roles are considered when traversing
the tree. The DIALOG and OPTIONPANE roles, needed to find the status
bar in Writer's "Edit Contour" dialog were not taken into
account yet, so the status bar was not found and could
therefore not be announced when pressing NVDA+End.

In addition, the status bar object in dialogs like that one
did not have the proper role in LibreOffice yet.

 ### Description of user facing changes

Status bar announcement for LibreOffice using the NVDA+End keyboard
shortcut now also works for dialogs and with the upcoming LibreOffice
version 24.2.

 ### Description of development approach

LibreOffice is adapted to expose the proper role for the status
bar in dialogs like the one mentioned above:
https://gerrit.libreoffice.org/c/core/+/157659

The DIALOG and OPTIONPANE roles are now also considered
by NVDA when traversing the a11y tree to find the status bar.

In addition, the FRAME role is also taken into account,
which is needed to support finding the status bar in
the default application window with LibreOffice >= 24.2,
see commit message of this LibreOffice change for more details:
https://gerrit.libreoffice.org/c/core/+/157658

Add a check whether the statusbar children have the
'IAccessibleTextObject' member before accessing it.

 ### Testing strategy:

1) Start LibreOffice Writer (current development version including
   https://gerrit.libreoffice.org/c/core/+/157659 )
2) insert a Formula: "Insert" -> "OLE Object" -> "Formula Object", type any formula, e.g. "1+1=2"
3) click outside of the formula then click the formula object again to focus it
4) in Writer's menu, select "Format" -> "Wrap" -> "Edit Contour"
5) Once the dialog shows up, press NVDA+End to announce the status bar

 ### Known issues with pull request:

Requires https://gerrit.libreoffice.org/c/core/+/157659
on LibreOffice side in addition for the announcement to
actually work.

 ### Code Review Checklist:

- [x] Documentation:
  - Change log entry
  - User Documentation
  - Developer / Technical Documentation
  - Context sensitive help for GUI changes
- [x] Testing:
  - Unit tests
  - System (end to end) tests
  - Manual testing
- [x] UX of all users considered:
  - Speech
  - Braille
  - Low Vision
  - Different web browsers
  - Localization in other languages / culture than English
- [x] API is compatible with existing add-ons.
- [x] Security precautions taken.