fix: correct DatabaseMetaData.getTableTypes() to return table type names

[KaviarasuSakthivadivel]

Bug: getTableTypes() was returning Map.toString() output instead of table type names, violating the JDBC specification.

Problem

DatabaseMetaData.getTableTypes() returns Map objects instead of table type names.

Current: {SCHEMAS=c.relkind = 'r'..., NOSCHEMAS=...}
Expected: TABLE, VIEW, INDEX

Fix

Changed entry.getValue() to entry.getKey() in QueryMetadataUtil.java:320

Added test to prevent regression.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.79%. Comparing base (f8d84ab) to head (840fafa).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #162   +/-   ##
=========================================
  Coverage     82.79%   82.79%           
  Complexity     1347     1347           
=========================================
  Files           111      111           
  Lines          4058     4058           
  Branches        413      413           
=========================================
  Hits           3360     3360           
  Misses          508      508           
  Partials        190      190           

Components	Coverage Δ
JDBC Core	83.98% <100.00%> (ø)
JDBC Main	40.69% <ø> (ø)
JDBC HTTP	91.09% <ø> (ø)
JDBC Utilities	66.07% <ø> (ø)
Spark Datasource	∅ <ø> (∅)

Files with missing lines	Coverage Δ
...esforce/datacloud/jdbc/core/QueryMetadataUtil.java	91.63% <100.00%> (ø)

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