Remove nonsensical cast_to_email and cast_to_uri functions

[Anish9901]

Fixes #3555

Updated list of valid cast functions for email and uri types:

mathesar=# \df mathesar_types.cast_to_email
                                  List of functions
     Schema     |     Name      |   Result data type   | Argument data types  | Type 
----------------+---------------+----------------------+----------------------+------
 mathesar_types | cast_to_email | mathesar_types.email | character            | func
 mathesar_types | cast_to_email | mathesar_types.email | character varying    | func
 mathesar_types | cast_to_email | mathesar_types.email | mathesar_types.email | func
 mathesar_types | cast_to_email | mathesar_types.email | text                 | func
(4 rows)

mathesar=# \df mathesar_types.cast_to_uri
                               List of functions
     Schema     |    Name     |  Result data type  | Argument data types | Type 
----------------+-------------+--------------------+---------------------+------
 mathesar_types | cast_to_uri | mathesar_types.uri | character           | func
 mathesar_types | cast_to_uri | mathesar_types.uri | character varying   | func
 mathesar_types | cast_to_uri | mathesar_types.uri | mathesar_types.uri  | func
 mathesar_types | cast_to_uri | mathesar_types.uri | text                | func
(4 rows)

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[Anish9901]

Since we create identical cast functions in create_datetime_casts(), I've removed this function.

[mathemancer]

Nice catch.

[mathemancer]

The resulting cast functions look like the right ones. But, there's a problem.

You need to either:

• restore these, but make a different category for installing casts, or
• Use different logic in the record selector search function (see db/records/operations/relevance.py)

The problem is that if we merge this PR, you won't really be able to find records by searching email or URL columns.

[mathemancer]

Nice catch.

[mathemancer]

Removing these with no other changes results in breaking searching for emails and URLs in the record selector.

[Anish9901]

Ohh I see, thanks for pointing that out!

[mathemancer]

Okay, this is good to go. Thanks!