Reduce Clojure linter warning noise (#17491)

Change the make "lint" target default behavior to NOT show clj-kondo warnings.

In the CI, I kept the same behavior, i.e. show all warnings and errors
simultaneously.

Motivation:
When devs run make lint, most of the time, they don't want to see a long list of
warnings. Their focus is on the errors. Additionally, the majority of devs in
the mobile team see clj-kondo warnings in their editors of choice already.

We (some of us) believe the editor feedback/warnings are sufficiently noisy.

Add the following somewhere in your config files if you want to see
warnings.

    export CLJ_LINTER_PRINT_WARNINGS=true

Makefile

@@ -309,10 +309,11 @@ $$(comm -23 <(sort <(git ls-files --cached --others --exclude-standard)) <(sort
 endef
 
 lint: export TARGET := clojure
+lint: export CLJ_LINTER_PRINT_WARNINGS ?= false
 lint: ##@test Run code style checks
 	@sh scripts/lint-re-frame-in-quo-components.sh && \
-	sh scripts/lint-old-quo-usage.sh \
-	clj-kondo --config .clj-kondo/config.edn --cache false --fail-level error --lint src && \
+	sh scripts/lint-old-quo-usage.sh && \
+	clj-kondo --config .clj-kondo/config.edn --cache false --fail-level error --lint src $(if $(filter $(CLJ_LINTER_PRINT_WARNINGS),true),,| grep -v ': warning: ') && \
 	ALL_CLOJURE_FILES=$(call find_all_clojure_files) && \
 	zprint '{:search-config? true}' -sfc $$ALL_CLOJURE_FILES && \
 	sh scripts/lint-trailing-newline.sh && \

ci/Jenkinsfile.tests

@@ -48,7 +48,7 @@ pipeline {
           steps {
             sh """#!/bin/bash
               set -eo pipefail
-              make lint 2>&1 | tee ${LOG_FILE}
+              make lint CLJ_LINTER_PRINT_WARNINGS=true 2>&1 | tee ${LOG_FILE}
             """
           }
         }

shadow-cljs.edn

@@ -129,6 +129,7 @@
     ;; needed because we use deref in tests
     :static-fns    false
     :optimizations :simple
+    :warnings      {:fn-deprecated false}
     :infer-externs true}}
 
   ;; mock.js-dependencies is mocking the react-native libraries