erp5_credential: assignment request module skeleton

erp5_credential: assignment request is a ticket

Try to not accumulate too many activities

Not reproduced...

  - move the logic of uploading to WebDAV server here instead of the
 generated bin/runUnitTest wrapper
  - run a new `coverage_report` which will
    - download all coverage data from WebDAV server
    - combine the data
    - run html report, saved in log folder
    - print text output in the text output.

This `coverage_report` test waits for other tests to finish uploading
data, we could extend test node distributor to distribute this test at
the end.

See merge request nexedi/erp5!1933

See merge request nexedi/erp5!1903

Move `spawnDrone` function (where user code is evaluated) and rename
used variables to avoid conflicts with the variables used by the user.
Previously if an user would have assign a value to `i` without declaring
the variable first, it would not have thrown any error as `i` was
already existing in the execution scope.

Even if null speed only makes sense for VTOL vehicules, it is a required testing feature as long as there is no dedicated API.

Loop interval is the time in milliseconds between 2 executions of the
onUpdate function of the user script as well as the periodicity to send
messages to the swarm (which means updating telemetry values).
As this is something we can set in SlapOS mostly to handle bandwith
usage, this must not be linked to the time delta used to update drone
position in the simulation.

Introduce `_callSetTargetCommand` function to regroup contraints on
command calls. Commands like `takeOff` and `land` should have such
constraints and therefore use `_internal_setTargetCoordinates` directly.

Timeout feature was broken by 2f7689d1 .

Add timeout check in tests.

 - str() because in ERP5JS the duration are directly serialized to json,
   which is not allowed.
 - int() to have a second level precision, which is more readable.

this is not used and cause a SyntaxWarning

This was based on libraries that were never ported to python3. If this
is still needed, it would have to be reimplemented with other newer
technologies.

See merge request !1932

Use same label as the action, "Preview"

These scripts take time to run, so restrict them to Manager users.

See merge request nexedi/erp5!1928

See merge request nexedi/erp5!1915

  The render is useful to preview content after edit while doing a gadget or on other contexts.

  Since corportate identity has erp5_web as dependency, it cause no harm to move.

See merge request nexedi/erp5!1919

   * const is handled as enum with a single value automatically
   * patch ensureArraySize to not modify the user input, let the user safely slice by himself.
   * Reorganise patches so it is grouped by prototype