Hide the bottom navigation container if there are no visible buttons.

[santosh-pingle]

IMPORTANT: All PRs must be linked to an issue (except for extremely trivial and straightforward changes).

Fixes #2446

Description
If there is no button visible in the bottom navigation container then it was overlapping review mode recyclerview, as result screen was appearing blank.
Now issue is fixed by hiding bottomNavigation container if there is no children.

Alternative(s) considered
Have you considered any alternatives? And if so, why have you chosen the approach in this PR?

Type
Choose one: Bug fix
Screenshots (if applicable)

Checklist

• I have read and acknowledged the Code of conduct.
• I have read the Contributing page.
• I have signed the Google Individual CLA, or I am covered by my company's Corporate CLA.
• I have discussed my proposed solution with code owners in the linked issue(s) and we have agreed upon the general approach.
• I have run ./gradlew spotlessApply and ./gradlew spotlessCheck to check my code follows the style guide of this project.
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• I have built and run the demo app(s) to verify my change fixes the issue and/or does not break the demo app(s).

[santosh-pingle]

Screen.Recording.2024-02-27.at.17.42.34.mov

[jingtang10]

thanks @santosh-pingle for the change!

as discussed, can you please explore ways to fix this issue in the layout xml files? that would be preferred over a fix in the kotlin code - at the end of the day, i feel it's more natural for the bottom navigation to collapse organically when no button is visible inside of it - this makes our code a bit simpler.

thanks!

[santosh-pingle]