utf8proc: add run_tests.sh (#13616)

run_tests.sh is used as part of Chronos with cached builds:
https://github.com/google/oss-fuzz/tree/master/infra/experimental/chronos#check-tests

```
$ infra/experimental/chronos/check_tests.sh utf8proc c++
...
...
Running tests...
Test project /src/utf8proc/build
      Start  1: utf8proc.testcase
 1/10 Test  #1: utf8proc.testcase ................   Passed    0.07 sec
      Start  2: utf8proc.testcustom
 2/10 Test  #2: utf8proc.testcustom ..............   Passed    0.01 sec
      Start  3: utf8proc.testiterate
 3/10 Test  #3: utf8proc.testiterate .............   Passed    0.01 sec
      Start  4: utf8proc.testmisc
 4/10 Test  #4: utf8proc.testmisc ................   Passed    0.01 sec
      Start  5: utf8proc.testprintproperty
 5/10 Test  #5: utf8proc.testprintproperty .......   Passed    0.00 sec
      Start  6: utf8proc.testvalid
 6/10 Test  #6: utf8proc.testvalid ...............   Passed    0.01 sec
      Start  7: utf8proc.testmaxdecomposition
 7/10 Test  #7: utf8proc.testmaxdecomposition ....   Passed    0.03 sec
      Start  8: utf8proc.testcharwidth
 8/10 Test  #8: utf8proc.testcharwidth ...........   Passed    0.09 sec
      Start  9: utf8proc.testgraphemetest
 9/10 Test  #9: utf8proc.testgraphemetest ........   Passed    0.01 sec
      Start 10: utf8proc.testnormtest
10/10 Test #10: utf8proc.testnormtest ............   Passed    0.35 sec

100% tests passed, 0 tests failed out of 10

Total Test time (real) =   0.58 sec
```

Signed-off-by: David Korczynski <david@adalogics.com>

Author: DavidKorczynski

projects/utf8proc/Dockerfile

@@ -25,4 +25,4 @@ RUN wget -O $SRC/utf8proc/test/NormalizationTest.txt https://www.unicode.org/Pub
 RUN wget -O $SRC/utf8proc/test/GraphemeBreakTest.txt https://www.unicode.org/Public/13.0.0/ucd/auxiliary/GraphemeBreakTest.txt
 
 WORKDIR $SRC/utf8proc/
-COPY build.sh $SRC/
+COPY *.sh $SRC/

projects/utf8proc/run_tests.sh

@@ -0,0 +1,19 @@
+#!/bin/bash -eux
+# Copyright 2025 Google LLC.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+cd build
+make test