[1.x] Changed column header to "Input file" in Notebook Job Definitions (jupyter-server#496) (jupyter-server#501)

* Changed column header to "Input file" in Notebook Job Definitions (jupyter-server#496)

* Changed column header to Input file in Notebook Job Definitions

* Update list-jobs.tsx for column header change in Notebook Jobs table

Changed the column headers for the inout file in both Notebook Jobs and Notebook Job Definitions to 'Input filename" - we choose “filename” over “file” is because we don’t show the absolute or relative path, just the name of the file in any directory.

* Updated E2E snapshots for test

* Update Playwright Snapshots

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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: srdas

src/mainviews/list-jobs.tsx

@@ -119,7 +119,7 @@ export function ListJobsTable(props: IListJobsTableProps): JSX.Element {
     },
     {
       sortField: 'input_filename',
-      name: trans.__('Input file')
+      name: trans.__('Input filename')
     },
     {
       sortField: null,