fix(postgres): minimum required changes for postgres builds

[ankush]

• Ignore duplicate fixtures in India setup (it's ignored by catching exception anyway)
• Fix several queries which are blocking creation of test fixtures.

TODO:

• Fix stock_ledger.py queries (separate PR) All stock ledger-related queries completely block tests from starting.

[codecov]

Codecov Report

Merging #30774 (88e257f) into develop (4ffea61) will decrease coverage by 0.11%.
The diff coverage is 96.15%.

@@             Coverage Diff             @@
##           develop   #30774      +/-   ##
===========================================
- Coverage    61.47%   61.35%   -0.12%     
===========================================
  Files         1079     1079              
  Lines        69583    69593      +10     
===========================================
- Hits         42775    42700      -75     
- Misses       26808    26893      +85     

Impacted Files	Coverage Δ
erpnext/accounts/party.py	78.09% <ø> (-4.33%)	⬇️
erpnext/manufacturing/doctype/bom/bom.py	87.48% <ø> (ø)
erpnext/stock/doctype/stock_entry/stock_entry.py	81.11% <ø> (ø)
erpnext/stock/doctype/item_price/item_price.py	94.73% <92.85%> (-1.10%)	⬇️
erpnext/accounts/doctype/tax_rule/tax_rule.py	91.20% <100.00%> (+0.29%)	⬆️
erpnext/crm/doctype/opportunity/opportunity.py	69.30% <100.00%> (-0.94%)	⬇️
erpnext/regional/india/setup.py	94.24% <100.00%> (-1.05%)	⬇️
erpnext/stock/stock_ledger.py	88.25% <100.00%> (-0.04%)	⬇️
erpnext/stock/utils.py	77.15% <100.00%> (-0.09%)	⬇️
...eport/item_variant_details/item_variant_details.py	31.32% <0.00%> (-53.02%)	⬇️
... and 31 more

[ankush]

merging this. Postgres tests are gonna fail for a foreseeable future 😄