Fix duplicated POM file lists in release workflow

[Copilot]

Addresses feedback from #497 about duplicated POM file lists making maintenance difficult.

Changes

• Parent POM version update (snapshot): Use find command instead of hardcoded list, consistent with release version step
• Git staging: Replace 8 explicit git add commands with git add **/pom.xml glob pattern in both commit steps

Before/After

# Before - duplicated in 4 places
for pom in custom-checks/pom.xml custom-checks/checkstyle/pom.xml custom-checks/findbugs/pom.xml ...; do
git add custom-checks/pom.xml
git add custom-checks/checkstyle/pom.xml
# ... 6 more lines

# After - single source of truth
for pom in $(find custom-checks sat-extension sat-plugin codestyle -name pom.xml); do
git add **/pom.xml

New modules are now automatically discovered.

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