RPC methods should exclude Jinja comments from compiled SQL

[jtcohen6]

Describe the bug

The compile_sql and run_sql methods of dbt rpc currently include Jinja comments {# #} in their compiled SQL.

Steps To Reproduce

1. Run an RPC server per docs

2. Send a request (method compile_sql or run_sql) where the SQL contains a Jinja comment

{
    "jsonrpc": "2.0",
    "method": "compile_sql",
    "id": "2db9a2fe-9a39-41ef-828c-25e04dd6b07d",
    "params": {
        "timeout": 60,
        "sql": "c2VsZWN0IHsjIDEgKyAxICN9IGFzIGlkCg==",
        "name": "my_first_query"
    }
}

3. Poll for result

...
"raw_sql": "select {# 1 + 1 #} as id\n",
"compiled_sql": "select {# 1 + 1 #} as id\n",
...

Expected behavior

"raw_sql": "select {# 1 + 1 #} as id\n",
"compiled_sql": "select  as id\n",

The output of dbt --version:

$ dbt --version
installed version: 0.17.1-rc4
   latest version: 0.17.0

Your version of dbt is ahead of the latest release!

Plugins:
  - bigquery: 0.17.1rc4
  - snowflake: 0.17.1rc4
  - redshift: 0.17.1rc4
  - postgres: 0.17.1rc4

[beckjake]

I missed this until just now, but this is in fact the same as #2707 - closing as it's fixed by #2718