[Android] Improve text view test

[jonnyandrew]

• Use Espresso ViewActions instead of onActivity + findViewById.
• Add FakeClickListener test util.
• Add assertions for the correct URL being clicked.
• Add test for parsing a mention and clicking it.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (c74e671) 87.43% compared to head (c1363fd) 87.28%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #896 +/- ## ============================================ - Coverage 87.43% 87.28% -0.15% Complexity 415 415 ============================================ Files 166 134 -32 Lines 18975 17387 -1588 Branches 1046 408 -638 ============================================ - Hits 16591 15177 -1414 + Misses 2085 1935 -150 + Partials 299 275 -24 ``` | [Flag](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/896/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | Coverage Δ | | |---|---|---| | [uitests](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/896/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | `65.87% <ø> (-5.32%)` | :arrow_down: | | [uitests-android](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/896/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | `65.87% <ø> (-0.05%)` | :arrow_down: | | [uitests-ios](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/896/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | `?` | | | [unittests](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/896/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | `86.57% <ø> (+1.09%)` | :arrow_up: | | [unittests-android](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/896/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | `44.94% <ø> (ø)` | | | [unittests-ios](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/896/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | `?` | | | [unittests-rust](https://app.codecov.io/gh/matrix-org/matrix-rich-text-editor/pull/896/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | `89.39% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org#carryforward-flags-in-the-pull-request-comment) to find out more.

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