chore: remove text_pattern_ops index on phone column

[issuedat]

We have an existing UNIQUE index on the phone column (users_phone_key) that can be reused for:

1. Exact match queries
2. Prefixed search queries (phone LIKE '123%') or range-based queries (phone > '123' AND phone < '123')
3. Order by clauses ORDER BY phone

text_pattern_ops indexes do not support ordering.

[coveralls]

Pull Request Test Coverage Report for Build 19663533951

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.009%) to 68.33%

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Totals
Change from base Build 19636370271:	-0.009%
Covered Lines:	14402
Relevant Lines:	21077

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💛 - Coveralls