* Always propagate non-credential properties from AccessConfig to clients (apache#2615)

* Always propagate non-credential properties from AccessConfig to clients

This change builds on top of apache#2589 and further prepares Polaris code to
support non-STS S3 implementations for apache#2589.

For S3 implementations that do have STS, this change enables clients to
run with local credentials (no credential vending) and still receive
endpoint configuration from the catalog.

* Call `SupportsCredentialDelegation.getAccessConfig()` on all relevant
  create/load requests (previously it was called only when
  `vended-credentials` was requested

* Always sent `AccessConfig.extraProperties()` to clients

* Expose credentials to clients only when the `vended-credentials` access
  delegation mode is requested.

* There is not client-visible behaviour change for implementations of
  `PolarisStorageIntegration` that do not produce "extra" `AccessConfig`
  properties.

* [OpenAPI Modification] Return created objects (apache#2603)

As per the ML thread [here](https://lists.apache.org/thread/q7q0rrsmw5gcqv30g4hr9ffq3gtr72yk), this PR introduces the change to return all objects that are created within their respective API calls.

* chore(docs): reorganize getting-started section (apache#2611)

* fix(deps): update dependency org.assertj:assertj-core to v3.27.6 (apache#2651)

* fix: fix broken markdown-link-check CI job after apache#2611 got merged (apache#2655)

* Release artifacts should use dlcdn.apache.org (signature and checksum must refer downloads.apache.org) (apache#2647)

* docs: Update S3 getting started guides (apache#2652)

* fix(deps): update dependency com.google.cloud:google-cloud-storage-bom to v2.58.0 (apache#2660)

* fix(deps): update dependency org.apache.spark:spark-sql_2.12 to v3.5.7 (apache#2659)

* fix(deps): update dependency org.apache.spark:spark-sql_2.12 to v3.5.7 (apache#2658)

* Fix Issue 2024 for Rendering Blockquotes (apache#2656)

* Fix Issue 2024 for Rendering Blockquotes

* Small fix for URLs

* Update license

* Last merged commit fcb6b33

---------

Co-authored-by: Dmitri Bourlatchkov <dmitri.bourlatchkov@gmail.com>
Co-authored-by: Adnan Hemani <adnan.h@berkeley.edu>
Co-authored-by: Artur Rakhmatulin <artur.rakhmatulin@gmail.com>
Co-authored-by: Mend Renovate <bot@renovateapp.com>
Co-authored-by: JB Onofré <jbonofre@apache.org>
Co-authored-by: Adam Christian <105929021+adam-christian-software@users.noreply.github.com>