[cleanup][pom] Remove unused TestNG conf files and clean up repeated notes (#16004)

Signed-off-by: tison <wander4096@gmail.com>

Author: tisonkun

build/run_integration_group.sh

@@ -173,7 +173,7 @@ test_group_pulsar_connectors_process() {
   # run integration source
   mvn_run_integration_test --retry --skip-build-deps "$@" -DintegrationTestSuiteFile=pulsar-process.xml -DintegrationTests -Dgroups=source
 
-  # run integraion sink
+  # run integration sink
   mvn_run_integration_test --retry --skip-build-deps "$@" -DintegrationTestSuiteFile=pulsar-process.xml -DintegrationTests -Dgroups=sink
 }
 

tests/bc_2_0_0/src/test/resources/pulsar.xml

@@ -19,8 +19,6 @@
 
 -->
 <!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd" >
-<!-- TODO: we have to put suite files in one file to avoid executing TESTNG test suites multiple times.
-           see {@link https://github.com/cbeust/testng/issues/508} -->
 <suite name="Pulsar Standalone Tests" verbose="2" annotations="JDK">
     <test name="pulsar-standalone-suite" preserve-order="true" >
         <classes>

tests/bc_2_0_1/src/test/resources/pulsar.xml

@@ -19,8 +19,6 @@
 
 -->
 <!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd" >
-<!-- TODO: we have to put suite files in one file to avoid executing TESTNG test suites multiple times.
-           see {@link https://github.com/cbeust/testng/issues/508} -->
 <suite name="Pulsar Standalone Tests" verbose="2" annotations="JDK">
     <test name="pulsar-standalone-suite" preserve-order="true" >
         <classes>

tests/bc_2_6_0/src/test/resources/backwards-client.xml

@@ -19,8 +19,6 @@
 
 -->
 <!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd" >
-<!-- TODO: we have to put suite files in one file to avoid executing TESTNG test suites multiple times.
-           see {@link https://github.com/cbeust/testng/issues/508} -->
 <suite name="Pulsar Standalone Tests" verbose="2" annotations="JDK">
     <test name="pulsar-standalone-suite" preserve-order="true" >
         <classes>

tests/integration/src/test/resources/pulsar-cli-suite.xml

@@ -19,8 +19,6 @@
 
 -->
 <!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd" >
-<!-- TODO: we have to put suite files in one file to avoid executing TESTNG test suites multiple times.
-           see {@link https://github.com/cbeust/testng/issues/508} -->
 <suite name="Pulsar Test Suite" parallel="instances" thread-count="1">
     <suite-files>
         <suite-file path="./pulsar-cli.xml" />

tests/integration/src/test/resources/pulsar-process-suite.xml

@@ -19,8 +19,6 @@
 
 -->
 <!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd" >
-<!-- TODO: we have to put suite files in one file to avoid executing TESTNG test suites multiple times.
-           see {@link https://github.com/cbeust/testng/issues/508} -->
 <suite name="Pulsar Shade Tests" verbose="2" annotations="JDK">
     <test name="pulsar-client-admin-shade-suite" preserve-order="true" >
         <classes>

tests/integration/src/test/resources/pulsar-schema-suite.xml

@@ -19,8 +19,6 @@
 
 -->
 <!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd" >
-<!-- TODO: we have to put suite files in one file to avoid executing TESTNG test suites multiple times.
-           see {@link https://github.com/cbeust/testng/issues/508} -->
 <suite name="Pulsar Shade Tests" verbose="2" annotations="JDK">
     <test name="pulsar-client-all-shade-suite" preserve-order="true" >
         <classes>

tests/integration/src/test/resources/pulsar-sql-suite.xml

@@ -19,8 +19,6 @@
 
 -->
 <!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd" >
-<!-- TODO: we have to put suite files in one file to avoid executing TESTNG test suites multiple times.
-           see {@link https://github.com/cbeust/testng/issues/508} -->
 <suite name="Pulsar Shade Tests" verbose="2" annotations="JDK">
     <test name="pulsar-client-shade-suite" preserve-order="true" >
         <classes>