PHPLIB-1704 Upmerge v1.21 into v1.x

[GromNaN]

Related to PHPLIB-1704.

The branch 1.x it considered "more recent" than 1.21.x and is installed by composer with when stability=dev.

[evergreen-ci-prod]

There is an existing patch(es) for this commit SHA:

• Evergreen patch with PR

Please note that the status that is posted is not in the context of this PR but rather the (latest) existing patch and that may affect some tests that may depend on the particular PR. If your tests do not rely on any PR-specific values (like base or head branch name) then your tests will report the same status. If you would like a patch to run in the context of this PR and abort the other(s), comment 'evergreen retry'.

[Copilot]

Pull Request Overview

This PR removes serverless-related functionality from the MongoDB PHP Library as part of an upmerge from v1.21 to v1.x. The changes eliminate serverless testing infrastructure, serverless-specific test annotations, and serverless detection logic.

Key changes:

• Removed serverless detection methods and related environment variable handling
• Eliminated serverless test groups and configuration from test files
• Updated encrypted fields handling to improve collection dropping behavior
• Removed serverless-specific Evergreen CI configuration and test tasks

Reviewed Changes

Copilot reviewed 26 out of 28 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/specifications	Updated subproject commit hash
tests/drivers-evergreen-tools	Updated subproject commit hash
tests/UnifiedSpecTests/UnifiedTestRunner.php	Removed serverless detection logic and simplified run-on requirements
tests/UnifiedSpecTests/UnifiedSpecTest.php	Removed serverless test group annotations from test methods
tests/UnifiedSpecTests/RunOnRequirement.php	Simplified serverless requirement checking logic
tests/SpecTests/RetryableWrites/Prose3_ReturnOriginalErrorTest.php	Removed serverless test group annotation
tests/SpecTests/FunctionalTestCase.php	Removed isServerless() method and simplified serverless requirement logic
tests/SpecTests/ClientSideEncryptionSpecTest.php	Removed serverless test group annotation
tests/SpecTests/ClientSideEncryption/Prose22_RangeExplicitEncryptionTest.php	Removed serverless test group annotation
tests/SpecTests/ClientSideEncryption/Prose21_AutomaticDataEncryptionKeysTest.php	Removed serverless test group annotation
tests/Functions/GetEncryptedFieldsFromServerFunctionalTest.php	Added new test file for encrypted fields functionality
tests/FunctionalTestCase.php	Removed isServerless() method and related imports
tests/Database/DatabaseFunctionalTest.php	Added tests for autoEncryptionEnabled option inheritance
tests/Collection/CollectionFunctionalTest.php	Added tests for autoEncryptionEnabled option inheritance
src/functions.php	Simplified get_encrypted_fields_from_server function signature
src/Database.php	Added autoEncryptionEnabled property and improved encrypted fields handling
src/Collection.php	Added autoEncryptionEnabled property and improved encrypted fields handling
src/Client.php	Added autoEncryptionEnabled tracking based on autoEncryption driver option
CONTRIBUTING.md	Removed serverless testing documentation
.github/workflows/merge-up.yml	Updated workflow action version and added ignored branches configuration
.evergreen/run-tests.sh	Removed serverless test case
.evergreen/config/test-tasks.yml	Removed serverless test tasks
.evergreen/config/test-task-groups.yml	Removed serverless task groups
.evergreen/config/templates/test-variant/phpc.yml	Removed serverless task group references
.evergreen/config/templates/test-variant/modern-php-full.yml	Removed serverless task group references
.evergreen/config/functions.yml	Removed serverless instance management functions

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