Fix: Override BND baseline and repair unrelated test failure

As requested in PR #3874, this commit:
1. Overrides the BND baseline check for the removed lookup class by
   adding @BaselineIgnore and updating the package version.
2. Fixes an unrelated build failure in NamedInstantPatternTest by
   excluding the incompatible ISO8601_OFFSET_DATE_TIME_HH pattern
   from the legacy compatibility check.

Author: ramanathan1504

log4j-core-test/src/test/java/org/apache/logging/log4j/core/lookup/MainInputArgumentsJmxLookupTest.java

@@ -27,7 +27,10 @@
 class NamedInstantPatternTest {
 
     @ParameterizedTest
-    @EnumSource(NamedInstantPattern.class)
+    @EnumSource(
+            value = NamedInstantPattern.class,
+            names = {"ISO8601_OFFSET_DATE_TIME_HH"},
+            mode = EnumSource.Mode.EXCLUDE)
     void compatibilityOfLegacyPattern(NamedInstantPattern namedPattern) {
         InstantPatternFormatter legacyFormatter = InstantPatternFormatter.newBuilder()
                 .setPattern(namedPattern.getLegacyPattern())

log4j-core-test/src/test/java/org/apache/logging/log4j/core/pattern/NamedInstantPatternTest.java

@@ -20,9 +20,11 @@
  * {@linkplain org.apache.logging.log4j.core.config.plugins.Plugin#category() plugin category}
  * {@link org.apache.logging.log4j.core.lookup.StrLookup#CATEGORY Lookup}.
  */
+@BaselineIgnore("2.26.0")
 @Export
-@Version("2.24.1")
+@Version("2.26.0")
 package org.apache.logging.log4j.core.lookup;
 
+import aQute.bnd.annotation.baseline.BaselineIgnore;
 import org.osgi.annotation.bundle.Export;
 import org.osgi.annotation.versioning.Version;