Preparation work for 4.28 (2023-06) and open master for development

[MohananRahul]

• Create R4_27_maintenance branch #927
• Update R4_27 maintenance branch with release version for 4.27+ changes #958
• Move 4.27-I builds to R4_27_maintenance branch #933
• Update Parent pom and target sdk deployment jobs for R4_27_maintenance branch #936
• Create new test jobs for 4.28 #939
• Configure SWT build scripts for 4.28 eclipse.platform.swt#565
• Splash Screen for 4.28 (2023-06) eclipse.platform#345
• Create 4.28-I-builds repo #932
• POM and product version changes for 4.28 release #916
• Update product version number to 4.28 across build scripts #921
• Move previous version to 4.27RC2 across build scripts #931
• Update version number in Mac's Eclipse.app for 4.28 eclipse-equinox/equinox#224
• Disable the freeze report for 4.28 #940
• Clean forceQualifierUpdate files for doc bundles eclipse.platform.common#117
• Cleanup approved api list #941
• Update builds and repo cleanup scripts for 4.28 #922
• Create new I-build job for 4.28 release #938
• Update check composites script to verify 4.28 repositories #923
• Update Comparator repo and eclipse run repo to 4.28-I-builds repo #937
• Version bumps for 4.28 stream #917
• Update previous release version to 4.27 GA across build scripts #957
• Update build calendar for platform 4.28 release #915
• Deploy ecj compiler from 4.27 GA and use it for 4.28 M1 build #960
• Update generic repos I-builds, Y-builds, P-builds to point to 4.28 repos #959

For previous issue refer to #496

[sravanlakkimsetti]

all the dependent tasks complete closing