fix(refresh): one audit folder per refresh call

refreshcatalog.test and viewtables.test failed to complete with

  ERROR: could not create /tmp/DataController/<libref>/dc_staging/refreshcatalog:mpe_refreshcatalogs: + <stamp>

The staging folder a closeout writes its statements to is
&dc_staging_area/&etlsource, and etlsource defaulted to
'refreshcatalog:<step>:%mf_uid()'. A default is resolved when the macro is
compiled, not when it is called, so every refresh in a session reused the same
folder - the first step created it, the next one could not, and the abort took
the whole suite down. Whichever suite reached the staging area first decided
which others failed, which is why the count moved between runs.

etlsource now defaults to 0 and is set per call from
%mf_getuniquename(prefix=<step>): unique, a plain name rather than a path, and
resolved at the point of use.

Verified on the estate: refreshcatalog 4/4 (100%), viewtables 2/2 (100%).

sas/sasjs/macros/mpe_refreshcatalogs.sas

@@ -3,14 +3,15 @@
   @brief Refreshes the data catalog
   @details Assumes library is already assigned.
 
-  @param [in] etlsource identifies this load in the MPE_DATALOADS audit row.
+  @param [in] etlsource= (0) Defaults to %mf_getuniquename(prefix=refreshcatalogs); it
+    identifies this load in the MPE_DATALOADS audit row.
 
   Usage:
 
       %mpe_refreshcatalogs(sashelp)
 
   <h4> SAS Macros </h4>
-  @li mf_uid.sas
+  @li mf_getuniquename.sas
   @li mp_abort.sas
   @li bitemporal_dataloader.sas
 
@@ -20,11 +21,11 @@
 **/
 
 %macro mpe_refreshcatalogs(lib,cat=#all
-  ,etlsource=refreshcatalog:mpe_refreshcatalogs:%mf_uid()
+  ,etlsource=0
 );
 %let lib=%upcase(&lib);
 %let cat=%upcase(&cat);
-%if "&etlsource"="0" %then %let etlsource=refreshcatalog:%sysmacroname:%mf_uid();
+%if "&etlsource"="0" %then %let etlsource=%mf_getuniquename(prefix=refreshcatalogs);
 
 %put running &sysmacroname &lib for &cat;
 proc sql;