pgsql: Improve code coverage of select_parallel test.

Improve code coverage of select_parallel test.

Make sure that rescans of parallel indexscans are tested.
Per code coverage report.

Branch
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REL_10_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/4c7af96365d6a50c4f807a97dd37ac3e9c7459cf

Modified Files
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src/test/regress/expected/select_parallel.out | 55 +++++++++++++++++++++++++++
src/test/regress/sql/select_parallel.sql | 20 ++++++++++
2 files changed, 75 insertions(+)

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