fix(test): Force usage of ReadAPI

[o-shevchenko]

Fixes googleapis/java-bigquerystorage#2764

Related issue: #3574

SDK still uses the old API and just skips ReadAPI, even if it's enabled.
This happens because of this check:

java-bigquery/google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/ConnectionImpl.java

Line 1201 in 08c483c

boolean isFastQuerySupported() {

In order to use ReadAPI, we need to add any of these configurations, for example, setJobTimeoutMs.
After this, we will see Not Using Fast Query Path, using jobs.insert and Using BigQuery Read API instead of Using Fast Query Path.

After enabling ReadAPI we've got 6-10x speed improvement:

Benchmark                                     (rowLimit)  Mode  Cnt       Score   Error  Units
ConnImplBenchmark.iterateRecordsUsingReadAPI      500000  avgt        16439.884          ms/op
ConnImplBenchmark.iterateRecordsUsingReadAPI     1000000  avgt        16005.065          ms/op
ConnImplBenchmark.iterateRecordsUsingReadAPI    10000000  avgt        74471.796          ms/op
ConnImplBenchmark.iterateRecordsUsingReadAPI    50000000  avgt       484732.516          ms/op
ConnImplBenchmark.iterateRecordsUsingReadAPI   100000000  avgt        48608.101          ms/op

[PhongChuong]

/gcbrun

[PhongChuong]

Thanks for the fix.