[IAST] fix tainting values stored in the db (#6389)

## Summary of changes

Add tests and corrections to support for various database platforms.

## Reason for change

Some bugs were reported relating to database tainting not working
correctly for some dbs.

## Test coverage

Adds new integration tests dependent on docker db instances.

Author: robertpi

Datadog.Trace.sln

@@ -596,6 +596,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "AssemblyLoadContextResolve"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Samples.AspNet.MultipleAppsInDomain", "tracer\test\test-applications\aspnet\Samples.AspNet.MultipleAppsInDomain\Samples.AspNet.MultipleAppsInDomain.csproj", "{A82EB6F8-D8D0-4763-B252-08CA3F39D153}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Samples.Security.AspNetCore5.DatabaseIntegration", "tracer\test\test-applications\security\Samples.Security.AspNetCore5.DatabaseIntegration\Samples.Security.AspNetCore5.DatabaseIntegration.csproj", "{067CE939-C803-4959-890A-B6B34C83F87A}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -1428,6 +1430,10 @@ Global
 		{A82EB6F8-D8D0-4763-B252-08CA3F39D153}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{A82EB6F8-D8D0-4763-B252-08CA3F39D153}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{A82EB6F8-D8D0-4763-B252-08CA3F39D153}.Release|Any CPU.Build.0 = Release|Any CPU
+		{067CE939-C803-4959-890A-B6B34C83F87A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{067CE939-C803-4959-890A-B6B34C83F87A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{067CE939-C803-4959-890A-B6B34C83F87A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{067CE939-C803-4959-890A-B6B34C83F87A}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -1660,6 +1666,7 @@ Global
 		{D6155F26-8245-4B66-8944-79C3DF9F9DA3} = {BAF8F246-3645-42AD-B1D0-0F7EAFBAB34A}
 		{8B1AF6A7-DD41-4347-B637-90C23D69B50E} = {498A300E-D036-49B7-A43D-821D1CAF11A5}
 		{A82EB6F8-D8D0-4763-B252-08CA3F39D153} = {AFA0AB23-64F0-4AC1-9050-6CE8FE06F580}
+		{067CE939-C803-4959-890A-B6B34C83F87A} = {0972AD57-B16B-494F-AE0A-091DD6F3B42B}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {160A1D00-1F5B-40F8-A155-621B4459D78F}