Always report rng seed from builtin reporters

Not all reporters use a format that supports this, so TeamCity
and Automake reporters still do not report it. The console
reporter now reports it even on successful runs, where before
it only reported the rng seed in the header, which was showed
either for failed run, or for run with `-s`.

CLoses #2065

tests/SelfTest/Baselines/compact.sw.approved.txt

@@ -1,3 +1,5 @@
+Filters: ~[!nonportable]~[!benchmark]~[approvals] *
+RNG seed: 1
 Misc.tests.cpp:<line number>: passed: with 1 message: 'yay'
 Compilation.tests.cpp:<line number>: passed: y.v == 0 for: 0 == 0
 Compilation.tests.cpp:<line number>: passed: 0 == y.v for: 0 == 0

tests/SelfTest/Baselines/compact.sw.multi.approved.txt

@@ -1,3 +1,5 @@
+Filters: ~[!nonportable]~[!benchmark]~[approvals] *
+RNG seed: 1
 Misc.tests.cpp:<line number>: passed: with 1 message: 'yay'
 Compilation.tests.cpp:<line number>: passed: y.v == 0 for: 0 == 0
 Compilation.tests.cpp:<line number>: passed: 0 == y.v for: 0 == 0

tests/SelfTest/Baselines/console.std.approved.txt

@@ -1,11 +1,10 @@
 Filters: ~[!nonportable]~[!benchmark]~[approvals] *
+Randomness seeded to: 1
 
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 <exe-name> is a <version> host application.
 Run with -? for options
 
-Randomness seeded to: 1
-
 -------------------------------------------------------------------------------
 #1455 - INFO and WARN can start with a linebreak
 -------------------------------------------------------------------------------

tests/SelfTest/Baselines/console.sw.approved.txt

@@ -1,11 +1,10 @@
 Filters: ~[!nonportable]~[!benchmark]~[approvals] *
+Randomness seeded to: 1
 
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 <exe-name> is a <version> host application.
 Run with -? for options
 
-Randomness seeded to: 1
-
 -------------------------------------------------------------------------------
 # A test name that starts with a #
 -------------------------------------------------------------------------------

tests/SelfTest/Baselines/console.sw.multi.approved.txt

@@ -1,11 +1,10 @@
 Filters: ~[!nonportable]~[!benchmark]~[approvals] *
+Randomness seeded to: 1
 
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 <exe-name> is a <version> host application.
 Run with -? for options
 
-Randomness seeded to: 1
-
 -------------------------------------------------------------------------------
 # A test name that starts with a #
 -------------------------------------------------------------------------------

tests/SelfTest/Baselines/console.swa4.approved.txt

@@ -1,11 +1,10 @@
 Filters: ~[!nonportable]~[!benchmark]~[approvals] *
+Randomness seeded to: 1
 
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 <exe-name> is a <version> host application.
 Run with -? for options
 
-Randomness seeded to: 1
-
 -------------------------------------------------------------------------------
 # A test name that starts with a #
 -------------------------------------------------------------------------------

tests/SelfTest/Baselines/sonarqube.sw.approved.txt

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!-- rng-seed=1 -->
 <testExecutions version="1"loose text artifact
 >
   <file path="tests/<exe-name>/IntrospectiveTests/Clara.tests.cpp">

tests/SelfTest/Baselines/sonarqube.sw.multi.approved.txt

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!-- rng-seed=1 -->
 <testExecutions version="1">
   <file path="tests/<exe-name>/IntrospectiveTests/Clara.tests.cpp">
     <testCase name="Clara::Arg supports single-arg parse the way Opt does" duration="{duration}"/>

tests/SelfTest/Baselines/tap.sw.approved.txt

@@ -1,3 +1,4 @@
+# rng-seed: 1
 # # A test name that starts with a #
 ok {test-number} - with 1 message: 'yay'
 # #1027: Bitfields can be captured

tests/SelfTest/Baselines/tap.sw.multi.approved.txt

@@ -1,3 +1,4 @@
+# rng-seed: 1
 # # A test name that starts with a #
 ok {test-number} - with 1 message: 'yay'
 # #1027: Bitfields can be captured