[AQUMV] Store view query in gp_matview_aux for view matching.

[avamingli]

Move materialized views SQLs for AQUMV from pg_rewrite to gp_matview_aux.
This would allow for quicker access and filtering, bypassing the evaluation of the system's 200 built-in rule entries that are often irrelevant.

before this commits:

set enable_answer_query_using_materialized_views = on; 
explain(analyze, costs off, verbose) select count(a) from t_select;
                           QUERY PLAN
---------------------------------------------------------------------
 Gather Motion 3:1  (slice1; segments: 3) (actual time=0.000..0.000
rows=1 loops=1)
   Output: count
   ->  Seq Scan on public.mv_insert_select (actual time=0.000..0.000
rows=1 loops=1)
         Output: count
 Settings: enable_answer_query_using_materialized_views = 'on',
optimizer = 'off'
 Planning Time: 78.942 ms
   (slice0)    Executor memory: 114K bytes.
   (slice1)    Executor memory: 114K bytes avg x 3x(0) workers, 114K
bytes max (seg0).
 Memory used:  128000kB
 Optimizer: Postgres query optimizer
 Execution Time: 1.695 ms
(11 rows)

Planning Time: 78.942 ms

after this commits:

explain(analyze, costs off, verbose) select count(a) from t_select;
                                        QUERY PLAN
------------------------------------------------------------------------------------------
 Finalize Aggregate (actual time=4.000..4.000 rows=1 loops=1)
   Output: count(a)
   ->  Gather Motion 3:1  (slice1; segments: 3) (actual time=4.000..4.000 rows=3 loops=1)
         Output: (PARTIAL count(a))
         ->  Partial Aggregate (actual time=4.000..4.000 rows=1 loops=1)
               Output: PARTIAL count(a)
               ->  Seq Scan on public.t_select (actual time=4.000..4.000 rows=0 loops=1)
                     Output: a
 Settings: enable_answer_query_using_materialized_views = 'on', optimizer = 'off'
 Planning Time: 0.623 ms
   (slice0)    Executor memory: 114K bytes.
   (slice1)    Executor memory: 112K bytes avg x 3x(0) workers, 112K bytes max (seg0).
 Memory used:  128000kB
 Optimizer: Postgres query optimizer
 Execution Time: 1.670 ms
(15 rows)

Planning Time: 0.623 ms

Authored-by: Zhang Mingli avamingli@gmail.com

Fixes #ISSUE_Number

What does this PR do?

Type of Change

• Bug fix (non-breaking change)
• New feature (non-breaking change)
• Breaking change (fix or feature with breaking changes)
• Documentation update

Breaking Changes

Test Plan

• Unit tests added/updated
• Integration tests added/updated
• Passed make installcheck
• Passed make -C src/test installcheck-cbdb-parallel

Impact

Performance:

User-facing changes:

Dependencies:

Checklist

• Followed contribution guide
• Added/updated documentation
• Reviewed code for security implications
• Requested review from cloudberry committers

Additional Context

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