[BUG] Issues found by Spark UT Framework on RapidsMathFunctionsSuite

[GaryShen2008]

Describe the bug
Spark UT Framework enabled RapidsMathFunctionsSuite (#10743), with the following test cases explicitly excluded:
It occurs when enabling spark.rapids.sql.expression.Conv=true by #11141

• SPARK-33428 conv function shouldn't raise error if input string is too big, it's a known case described in Handle all special cases for Spak SQL conv #1314 spark-rapids-jni#1346
• SPARK-36229 conv should return result equal to -1 in base of toBase, it's a known case described in Handle all special cases for Spak SQL conv #1314 spark-rapids-jni#1346

These excluded test cases needs further investigating!!!
Notice: Other test cases in this suite may pass with falling back!

Steps/Code to reproduce bug

1. Compile everything with mvn -Dbuildver=330 install -DskipTests
2. Pick a test case name in the above table
3. Go to RapidsTestSettings and find the line starting with ".exclude" and containing the test case name, comment it out
4. Run the Suite then you'll see one failed test case. E.g. mvn -nsu -Dbuildver=330 -pl tests -Dsuites="org.apache.spark.sql.rapids.suites.RapidsXXXSuite" test (replace RapidsXXXSuite with the right name in issue header). ALWAYS double check if your suite name coincide with in source code, as it may contain typos!

Expected behavior
The suite can pass without excluding any test case.