[Cashtab][Alias] Deprecate reserved aliases

Summary:
T3216

Deprecate the use of reserved aliases in cashtab

Test Plan:
grep -r reservedAliases src/ and ensure no output
npm test

Reviewers: bytesofman, #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D14237