[web][native] Handle invalidSessionDowngrade for deleteKeyserverAccountActionTypes.success

Summary:
Session downgrade for deleteKeyserverAccountActionTypes may be invalid for a subset of keyservers. Imagine a user disconnected from 5 keyservers, and before the success came, they reconnected to 2 of them.

In such case, we want to edit the payload and only downgrade the session for the keyservers the user has not reconnected with.

Test Plan:
Dispatched an invalid session downgrade action (with a wrong cookie / sessionID)

{
	type: 'DELETE_KEYSERVER_ACCOUNT_SUCCESS',
	payload: {
		currentUserInfo: { anonymous: true },
		preRequestUserState: {
			currentUserInfo: { id: '83810', username: 'user1'},
			cookiesAndSessions: {['256']: {cookie: 'user=123', sessionID: '0'}}
		},
		keyserverIDs: ['256'],
	},
}

Checked that the code returned.

Dispatched an action which was an invalid session downgrade for only some keyservers

{
	type: 'DELETE_KEYSERVER_ACCOUNT_SUCCESS',
	payload: {
		currentUserInfo: { anonymous: true },
		preRequestUserState: {
			currentUserInfo: { id: '83810', username: 'user1'},
			cookiesAndSessions: {
				['256']: {cookie: <valid, current cookie>, sessionID: <valid, current sessionID>},
				['100']: {cookie: 'user=123', sessionID: '0'},
			}
		},
		keyserverIDs: ['256', '100'],
	},
}

And checked that the keyservers for which the downgrade was invalid were removed from the payload, and the edited action was passed to next reducers
[tested on web]

Reviewers: michal, kamil, ginsu

Reviewed By: michal

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D10963