User-defined tags fail to parse when inside an #include template section

[benkard]

Describe the bug
Given a user-defined tag hello and a template base, an attempt to parse a file foo.txt containing {#include base}{#item}{#hello name=name /}{/item}{/include} as a template fails with the following exception:

io.quarkus.qute.TemplateException: Parser error in template [foo.txt] on line 1: section block end tag [item] does not match the start tag [hello]
	at io.quarkus.qute.Parser.parserError(Parser.java:394)
	at io.quarkus.qute.Parser.flushTag(Parser.java:345)
	at io.quarkus.qute.Parser.tag(Parser.java:198)
	at io.quarkus.qute.Parser.processCharacter(Parser.java:149)
	at io.quarkus.qute.Parser.parse(Parser.java:106)
	at io.quarkus.qute.EngineImpl.load(EngineImpl.java:135)
	at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1708)
	at io.quarkus.qute.EngineImpl.getTemplate(EngineImpl.java:109)
	at io.quarkus.qute.deployment.QuteProcessor.analyzeTemplates(QuteProcessor.java:224)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
	at io.quarkus.deployment.ExtensionLoader$2.execute(ExtensionLoader.java:931)
	at io.quarkus.builder.BuildContext.run(BuildContext.java:277)
	at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
	at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:2027)
	at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1551)
	at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1442)
	at java.base/java.lang.Thread.run(Thread.java:832)
	at org.jboss.threads.JBossThread.run(JBossThread.java:479)

Expected behavior
There is no parse error. The {#hello name=name /} part of the template acts the same as its manual substitution.

Actual behavior
The template cannot be parsed and throws an exception instead. See above.

To Reproduce

1. Check out this branch: https://github.com/benkard/quarkus/tree/mulk/work/qute-user-tag-in-include-template
2. Run this unit test: https://github.com/benkard/quarkus/blob/mulk/work/qute-user-tag-in-include-template/extensions/qute/deployment/src/test/java/io/quarkus/qute/deployment/tag/UserTagIncludeTest.java, e.g. by running mvn verify -pl extensions/qute/deployment -am -Dtest=io.quarkus.qute.deployment.tag.UserTagIncludeTest -DfailIfNoTests=false

Environment (please complete the following information):

• Output of uname -a or ver: Darwin 19.4.0
• Output of java -version: OpenJDK Runtime Environment Zulu14.27+1-CA (build 14+36)
• Quarkus version or git rev: af5b3be65ef24f838f5d8aac48beaf20a51c1767
• Build tool: Apache Maven 3.6.3

Additional context

• https://github.com/benkard/quarkus/tree/mulk/work/qute-user-tag-in-include-template contains a unit test reproducing the bug. Feel free to cherry-pick it.
• This is a regression in 1.3.2.Final. 1.3.1.Final worked correctly.