UX cleanup: DM details screen (#2820)

* UX cleanup: user profile.

- Move send DM to a CTA button.
- Add 'Call' CTA button too when there is a DM with that user and a call is possible.
- Add missing tests.

* Update screenshots

* Add tests for clicking on the avatar

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Co-authored-by: ElementBot <benoitm+elementbot@element.io>

tests/testutils/src/main/kotlin/io/element/android/tests/testutils/EnsureCalledOnce.kt

@@ -105,3 +105,9 @@ fun <T, R> ensureCalledOnceWithParam(param: T, block: (callback: EnsureCalledOnc
     block(callback)
     callback.assertSuccess()
 }
+
+fun <P1, P2> ensureCalledOnceWithTwoParams(param1: P1, param2: P2, block: (callback: EnsureCalledOnceWithTwoParams<P1, P2>) -> Unit) {
+    val callback = EnsureCalledOnceWithTwoParams(param1, param2)
+    block(callback)
+    callback.assertSuccess()
+}