Rationalize logging statements across codebase

This fixes up the following problems:
1. Using string concatenation instead of the formatting variant methods.
2. Logging or swallowing exception messages without logging the exception
   itself (this swallows the stack trace).
3. Unnecessary logging on re-thrown exceptions.
4. Unnecessary use of formatting variant methods when not necessary.
5. Complicated logging statements involving significant processing not being
   wrapped inside of a logging level check.
6. Redundant logging both of an exception itself and its message (this is
   unnecessary duplication).
7. Use of the base Logger class instead of our FormattingLogger class.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=182419837

java/google/registry/billing/GenerateInvoicesAction.java

@@ -101,7 +101,7 @@ public class GenerateInvoicesAction implements Runnable {
       String jobId = launchResponse.getJob().getId();
       enqueuePublishTask(jobId);
     } catch (IOException e) {
-      logger.warningfmt("Template Launch failed due to: %s", e.getMessage());
+      logger.warning(e, "Template Launch failed");
       emailUtils.sendAlertEmail(String.format("Template Launch failed due to %s", e.getMessage()));
       response.setStatus(SC_INTERNAL_SERVER_ERROR);
       response.setContentType(MediaType.PLAIN_TEXT_UTF_8);