feat(k8s): use Lakekeeper as the Iceberg Catalog in the Kubernetes deployment

[mengw15]

What changes were proposed in this PR?

This PR adds the Kubernetes / Helm deployment for the Lakekeeper-based Result Service.

Files changed:

• bin/k8s/Chart.yaml: added Lakekeeper Helm chart dependency (lakekeeper v0.9.0)
• bin/k8s/values.yaml: added Lakekeeper and lakekeeperInit configuration (warehouse name, S3 bucket, region, default
  project)
• bin/k8s/templates/lakekeeper-init-job.yaml (new): Kubernetes Job that bootstraps Lakekeeper — creates MinIO bucket,
  default project, and warehouse
• bin/k8s/templates/external-names.yaml: added Lakekeeper ExternalName service for computing-unit-pool namespace access
• bin/k8s/templates/workflow-computing-unit-manager-deployment.yaml: switched from Postgres catalog to REST catalog env
  vars; added wait-lakekeeper init container
• bin/k8s/templates/webserver-deployment.yaml: added REST catalog env vars
• bin/k8s/templates/postgresql-init-script-config.yaml: added Lakekeeper database initialization
• bin/k8s/files/texera_lakekeeper.sql (new): symlink to sql/texera_lakekeeper.sql

Any related issues, documentation, discussions?

close #4610

How was this PR tested?

Manually tested

Was this PR authored or co-authored using generative AI tooling?

co-authored with claude

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.46%. Comparing base (8c07714) to head (c8001aa).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4275      +/-   ##
============================================
- Coverage     42.83%   42.46%   -0.38%     
+ Complexity     2204     2174      -30     
============================================
  Files          1045     1045              
  Lines         40130    39784     -346     
  Branches       4240     4194      -46     
============================================
- Hits          17190    16894     -296     
+ Misses        21874    21833      -41     
+ Partials       1066     1057       -9     

Flag	Coverage Δ		*Carryforward flag
access-control-service	39.53% <ø> (ø)
agent-service	33.72% <ø> (ø)		Carriedforward from 0e9c617
amber	43.20% <ø> (-0.50%)	⬇️	Carriedforward from 0e9c617
computing-unit-managing-service	0.00% <ø> (ø)
config-service	0.00% <ø> (ø)
file-service	32.18% <ø> (ø)
frontend	33.50% <ø> (-0.43%)	⬇️	Carriedforward from 0e9c617
python	88.89% <ø> (-0.11%)	⬇️	Carriedforward from 0e9c617
workflow-compiling-service	47.72% <ø> (ø)

*This pull request uses carry forward flags. Click here to find out more.

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[bobbai00]

LGTM! But I would like to have more people to test it. Can @xuang7 test this branch?

[xuang7]

LGTM! Tested on local k8s, services work fine. This branch is behind main, please sync before merging.