## Explanation
Fix Part of #5086: We found that the navigation buttons in some
questions were not displaying correctly in landscape mode on phones.
This issue affects the survey popup as well. See
#5104 (comment).

This PR introduces dedicated landscape layouts for the affected screens.

There are some minor bug fixes/ ux improvements also added that are
related to the survey behaviour:
1. Make the exit confirmation dialog non-cancelable so that the user
makes use of the dialog buttons.
2.Prevent accidentally exiting the survey by showing the exit
confirmation dialog on backpress.
3. Resume normal flow on exiting an exploration, when the survey is not
to be shown.

## Essential Checklist
<!-- Please tick the relevant boxes by putting an "x" in them. -->
- [x] The PR title and explanation each start with "Fix #bugnum: " (If
this PR fixes part of an issue, prefix the title with "Fix part of
#bugnum: ...".)
- [ ] Any changes to
[scripts/assets](https://github.com/oppia/oppia-android/tree/develop/scripts/assets)
files have their rationale included in the PR explanation.
- [x] The PR follows the [style
guide](https://github.com/oppia/oppia-android/wiki/Coding-style-guide).
- [ ] The PR does not contain any unnecessary code changes from Android
Studio
([reference](https://github.com/oppia/oppia-android/wiki/Guidance-on-submitting-a-PR#undo-unnecessary-changes)).
- [x] The PR is made from a branch that's **not** called "develop" and
is up-to-date with "develop".
- [x] The PR is **assigned** to the appropriate reviewers
([reference](https://github.com/oppia/oppia-android/wiki/Guidance-on-submitting-a-PR#clarification-regarding-assignees-and-reviewers-section)).

## For UI-specific PRs only

### Before 

![image](https://github.com/oppia/oppia-android/assets/59600948/46b76a8e-82f3-4dd3-9f95-d83268ccf9a5)

### After
![Screenshot 2023-07-28 at 00 25
19](https://github.com/oppia/oppia-android/assets/59600948/c9518e0b-d610-4532-91ce-d23b80e4dd1a)

### Before+Light Mode, After+Dark Mode
![Screenshot 2023-07-28 at 01 32
02](https://github.com/oppia/oppia-android/assets/59600948/89fbbdb5-7905-4afb-abb4-6bfd041466ae)

### Before+Light Mode, After+Dark Mode
![Screenshot 2023-07-28 at 01 40
50](https://github.com/oppia/oppia-android/assets/59600948/88ba0852-a95d-4b86-bc2f-2682da5908b0)

…_survey_dark_mode