[SPARK-42303][SQL] Assign name to _LEGACY_ERROR_TEMP_1326

### What changes were proposed in this pull request?

This PR proposes to assign name to _LEGACY_ERROR_TEMP_1326, "CANNOT_MODIFY_CONFIG".

### Why are the changes needed?

We should assign proper name to _LEGACY_ERROR_TEMP_*

### Does this PR introduce _any_ user-facing change?

No

### How was this patch tested?

`./build/sbt "sql/testOnly org.apache.spark.sql.SQLQueryTestSuite*"`

Closes apache#39873 from itholic/LEGACY_1326.

Authored-by: itholic <haejoon.lee@databricks.com>
Signed-off-by: Max Gekk <max.gekk@gmail.com>

Author: itholic

core/src/main/resources/error/error-classes.json

@@ -76,6 +76,13 @@
       "Could not load Protobuf class with name <protobufClassName>. <explanation>."
     ]
   },
+  "CANNOT_MODIFY_CONFIG" : {
+    "message" : [
+      "Cannot modify the value of the Spark config: <key>.",
+      "See also '<docroot>/sql-migration-guide.html#ddl-statements'."
+    ],
+    "sqlState" : "46110"
+  },
   "CANNOT_PARSE_DECIMAL" : {
     "message" : [
       "Cannot parse decimal."
@@ -3510,12 +3517,6 @@
       "Cannot modify the value of a static config: <key>."
     ]
   },
-  "_LEGACY_ERROR_TEMP_1326" : {
-    "message" : [
-      "Cannot modify the value of a Spark config: <key>.",
-      "See also '<docroot>/sql-migration-guide.html#ddl-statements'."
-    ]
-  },
   "_LEGACY_ERROR_TEMP_1327" : {
     "message" : [
       "Command execution is not supported in runner <runner>."

sql/catalyst/src/main/scala/org/apache/spark/sql/errors/QueryCompilationErrors.scala

@@ -2989,8 +2989,8 @@ private[sql] object QueryCompilationErrors extends QueryErrorsBase {
 
   def cannotModifyValueOfSparkConfigError(key: String, docroot: String): Throwable = {
     new AnalysisException(
-      errorClass = "_LEGACY_ERROR_TEMP_1326",
-      messageParameters = Map("key" -> key, "docroot" -> docroot))
+      errorClass = "CANNOT_MODIFY_CONFIG",
+      messageParameters = Map("key" -> toSQLConf(key), "docroot" -> docroot))
   }
 
   def commandExecutionInRunnerUnsupportedError(runner: String): Throwable = {

sql/core/src/test/scala/org/apache/spark/sql/internal/SQLConfSuite.scala

@@ -22,6 +22,7 @@ import java.util.TimeZone
 import org.apache.hadoop.fs.Path
 import org.apache.logging.log4j.Level
 
+import org.apache.spark.SPARK_DOC_ROOT
 import org.apache.spark.sql._
 import org.apache.spark.sql.catalyst.parser.ParseException
 import org.apache.spark.sql.catalyst.util.DateTimeTestUtils.MIT
@@ -204,9 +205,11 @@ class SQLConfSuite extends QueryTest with SharedSparkSession {
     sql("RESET spark.app.id")
     assert(spark.conf.get("spark.app.id") === appId, "Should not change spark core ones")
     // spark core conf w/ entry registered
-    val e1 = intercept[AnalysisException](sql("RESET spark.executor.cores"))
-    val str_match = "Cannot modify the value of a Spark config: spark.executor.cores"
-    assert(e1.getMessage.contains(str_match))
+    checkError(
+      exception = intercept[AnalysisException](sql("RESET spark.executor.cores")),
+      errorClass = "CANNOT_MODIFY_CONFIG",
+      parameters = Map("key" -> "\"spark.executor.cores\"", "docroot" -> SPARK_DOC_ROOT)
+    )
 
     // user defined settings
     sql("SET spark.abc=xyz")