Check RUN_TESTS parameter in GitHub Actions correctly (hazelcast#1352)

`RUN_TESTS` is a `String` parameter, so when we check it:
https://github.com/hazelcast/hazelcast-cpp-client/blob/d06c1893dc89d1d8ed19f7534c4cedea7a924fb4/.github/actions/build-test/ubuntu-x86_64/action.yml#L56-L57

We are actually checking if it's _populated_, not if it's `true`.

Author: JackPGreen

.github/actions/build-test/ubuntu-i386/action.yml

@@ -92,7 +92,7 @@ runs:
         ./scripts/install-thrift.sh ${{ inputs.THRIFT_VERSION }}
 
     - name: Configure Resources
-      if: ${{ inputs.run_tests }}
+      if: ${{ inputs.run_tests == 'true' }}
       shell: bash
       run: |
         ulimit -c unlimited

.github/actions/build-test/ubuntu-x86_64/action.yml

@@ -54,7 +54,7 @@ runs:
         sudo ./scripts/install-thrift.sh ${{ inputs.THRIFT_VERSION }}
 
     - name: Configure Resources
-      if: ${{ inputs.run_tests }}
+      if: ${{ inputs.run_tests == 'true' }}
       shell: bash
       run: |
         ulimit -c unlimited

.github/actions/build-test/unix/action.yml

@@ -49,7 +49,7 @@ runs:
             -DBUILD_EXAMPLES=OFF
 
     - name: Test
-      if: ${{ inputs.run_tests }}
+      if: ${{ inputs.run_tests == 'true' }}
       env:
         BUILD_DIR: build
         HAZELCAST_ENTERPRISE_KEY: ${{ inputs.HAZELCAST_ENTERPRISE_KEY }}

.github/actions/build-test/windows/action.yml

@@ -150,7 +150,7 @@ runs:
             -DBUILD_EXAMPLES=OFF
 
     - name: Test
-      if: ${{ inputs.run_tests }}
+      if: ${{ inputs.run_tests == 'true' }}
       env:
         BUILD_DIR: build
         BUILD_CONFIGURATION: ${{ inputs.BUILD_TYPE }}

.github/actions/coverage-report/action.yml

@@ -72,7 +72,7 @@ runs:
             -DBUILD_EXAMPLES=OFF
 
     - name: Test
-      if: ${{ inputs.run_tests }}
+      if: ${{ inputs.run_tests == 'true' }}
       env:
         BUILD_DIR: build
         HAZELCAST_ENTERPRISE_KEY: ${{ inputs.HAZELCAST_ENTERPRISE_KEY }}