HPCC-12542 Add ECLWatch UI to call resetquerystats

On the Query Details page, a 'Reset' button is added to
send WsWorkunits an HTTP request of WUQuerysetQueryAction
with Action='ResetQueryStats'. After the request is
received, the WsWorkunits resets query stats using
control:resetquerystats.

Signed-off-by: wangkx <kevin.wang@lexisnexis.com>
HPCC-9937 Add ecl-roxie-unused-files --delete option

When delete is specified ("ecl roxie unused-files myroxie --delete")
the unused files found will be deleted from DFS.

Signed-off-by: Anthony Fishbeck <anthony.fishbeck@lexisnexis.com>
Merge pull request #6624 from afishbeck/deleteUnusedFiles

HPCC-9937 Add ecl-roxie-unused-files --delete option

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>
HPCC-12542 Revise based on review comments

1. change == to ===;
2. change ' to ";
3. remove a blank line;
4. check if Response + Result exists, before accessing it

Signed-off-by: wangkx <kevin.wang@lexisnexis.com>
Merge pull request #6616 from wangkx/h11853

HPCC-12542 Add ECLWatch UI to call resetquerystats

Reviewed-By: Gordon Smith <gordon.smith@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>