Fixed misleading expansion variable log message in ci.common

[sajeerzeji]

Fixes OpenLiberty/ci.maven#2076

Reference: OpenLiberty/ci.maven#2076 (comment)

Moved the log call to after the full string is assembled, so the complete resolved path is shown, and updates the message format to clearly state which variable was expanded, the original expression it appeared in, and the fully resolved result. The corresponding IT assertions in ci.maven and ci.gradle are updated to match the new message format.

[sajeerzeji]

Below are the logs captured in different scenarios

Scenario 1: single variable

[INFO] Resolved environment variable "BASE" in path "${BASE}/bin" to "/usr/local/java"
[INFO] Resolved path "${BASE}/bin" to "/usr/local/java/bin"

Scenario 2: two variables combined

[INFO] Resolved environment variable "EXP_VAR" in path "${EXP_VAR}_${EXP_VAR2}" to "TEST"
[INFO] Resolved environment variable "EXP_VAR2" in path "${EXP_VAR}_${EXP_VAR2}" to "UNIX"
[INFO] Resolved path "${EXP_VAR}_${EXP_VAR2}" to "TEST_UNIX"

Scenario 3: recursive

[INFO] Resolved environment variable "ROOT" in path "${ROOT}/semeru" to "/opt/ibm"
[INFO] Resolved path "${ROOT}/semeru" to "/opt/ibm/semeru"
[INFO] Resolved environment variable "ROOT" in path "${ROOT}/semeru" to "/opt/ibm"
[INFO] Resolved path "${ROOT}/semeru" to "/opt/ibm/semeru"
[INFO] Resolved environment variable "JDK" in path "${JDK}/bin" to "/opt/ibm/semeru"
[INFO] Resolved path "${JDK}/bin" to "/opt/ibm/semeru/bin"

NOTE: ${ROOT}/semeru appears twice because it's resolved once for JDK and again when resolving JAVA_HOME_DERIVED through JDK