Add copy icon button account created screen

[Rawa]

Add the copy icon to make it clean that the user can copy the account number.

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This change is 

[linear]

DROID-316 Add copy icon button Account Created screen

Following screen should have a copy icon next to the account number.

https://app.zeplin.io/project/5f928a32fdc9962af9018d70/screen/609427603e45189c24fe66e2

[Rawa]

Reviewable status: 0 of 5 files reviewed, 1 unresolved discussion

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android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/component/CopyableObfuscationView.kt line 61 at r2 (raw file):

    val copy = {
        context.copyToClipboard(
            content = content,
            clipboardLabel = context.getString(R.string.mullvad_account_number)
        )
        SdkUtils.showCopyToastIfNeeded(
            context,
            context.getString(R.string.copied_mullvad_account_number)
        )
    }

This lambda should be replaced with the compose style of doing it long-term (LocalClipboardManager & SnackbarHostState for toast). However, I avoided doing this due to the third-party library used for Collapsible App Bar does not support Snackbar.

[Pururun]

Reviewed 3 of 5 files at r1, 1 of 1 files at r2, 1 of 1 files at r3, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion

[albin-mullvad]

Reviewable status: all files reviewed, 2 unresolved discussions (waiting on @Rawa)

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android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/component/CopyableObfuscationView.kt line 32 at r3 (raw file):

@Composable
fun CopyableObfuscationView(content: String) {
    var shouldObfuscated by remember { mutableStateOf(true) }

I'm aware that this var named was already used before this PR, but would be nice to improve/clarfiy it

Code quote:

shouldObfuscated

[Rawa]

Reviewable status: 4 of 6 files reviewed, all discussions resolved (waiting on @Pururun)

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android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/component/CopyableObfuscationView.kt line 32 at r3 (raw file):

Previously, albin-mullvad wrote…

I'm aware that this var named was already used before this PR, but would be nice to improve/clarfiy it

Fixed!

[Pururun]

Reviewed 2 of 2 files at r4, 2 of 2 files at r5, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved

[albin-mullvad]

Reviewed 1 of 1 files at r2, 2 of 2 files at r4, all commit messages.
Reviewable status: 5 of 6 files reviewed, all discussions resolved (waiting on @Pururun)

[Pururun]

Reviewed 1 of 1 files at r6, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved