[JackieTien97]

Description

When the user_encrypt_token environment variable is set (the TsFile encryption token, see
IoTDBStartCheck), 12 of the 14 PowerMock test classes in iotdb-core/datanode fail, on JDK 17 and
JDK 21 alike:

java.lang.IllegalAccessError: class javax.crypto.Mac (in unnamed module @...) cannot access class sun.security.util.Debug (in module java.base) because module java.base does not export sun.security.util to unnamed module @...
	at javax.crypto.Mac.<clinit>(Mac.java:77)
	at org.apache.tsfile.encrypt.EncryptUtils.getPRFLength(EncryptUtils.java:159)
	...
	at org.apache.tsfile.common.conf.TSFileDescriptor.overwriteConfigByCustomSettings(TSFileDescriptor.java:93)
	...
	at org.apache.tsfile.utils.FSUtils.<clinit>(FSUtils.java:36)

The rest of each class then fails with NoClassDefFoundError: Could not initialize class org.apache.tsfile.utils.FSUtils (or IoTDBDescriptor$IoTDBDescriptorHolder).

TSFileDescriptor derives the TsFile encryption key from user_encrypt_token with
javax.crypto.Mac while it initializes. PowerMock 2.0.9 defers only java.*,
javax.accessibility.*, sun.* and a few test packages to the system class loader, so inside a
PowerMock test javax.crypto.Mac is defined by PowerMock's MockClassLoader in an unnamed module,
and its static initializer cannot access java.base internals. CI does not set the variable, so it
is not affected, but anyone who keeps the variable in their shell (for example to work on TsFile
encryption) cannot run these tests locally.

Changes

Add iotdb-core/datanode/src/test/resources/org/powermock/extensions/configuration.properties with
powermock.global-ignore=javax.crypto.*. PowerMock merges this global list with each class's
@PowerMockIgnore, so every PowerMock test in the module (including future ones) loads
javax.crypto from the JDK. No test mocks javax.crypto.

Verification

All 14 PowerMock test classes in iotdb-core/datanode, run with
mvn test -pl iotdb-core/datanode -am -Dtest=<the 14 classes>:

	Before	After
JDK 21, user_encrypt_token set	12 classes fail (50 of 65 tests error or never run)	65/65 pass
JDK 17, user_encrypt_token set	12 classes fail (50 of 65 tests error or never run)	65/65 pass
JDK 21, unset	65/65 pass	65/65 pass
JDK 17, unset	65/65 pass	65/65 pass

The RAT license check passes for the new file.

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