[SPARK-13473][SQL] Simplifies PushPredicateThroughProject

## What changes were proposed in this pull request?

This is a follow-up of PR #11348.

After PR #11348, a predicate is never pushed through a project as long as the project contains any non-deterministic fields. Thus, it's impossible that the candidate filter condition can reference any non-deterministic projected fields, and related logic can be safely cleaned up.

To be more specific, the following optimization is allowed:

```scala
// From:
df.select('a, 'b).filter('c > rand(42))
// To:
df.filter('c > rand(42)).select('a, 'b)
```

while this isn't:

```scala
// From:
df.select('a, rand('b) as 'rb, 'c).filter('c > 'rb)
// To:
df.filter('c > rand('b)).select('a, rand('b) as 'rb, 'c)
```

## How was this patch tested?

Existing test cases should do the work.

Author: Cheng Lian <lian@databricks.com>

Closes #11864 from liancheng/spark-13473-cleanup.

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