add append and prepend to aiida_local_code_factory

[ezpzbz]

This PR aims to add the ability of adding append_text and prepend_text to the aiida_local_code_factory which is need in writing tests for codes where we need to have these extra fields.

[greschd]

Looks useful to me, thanks! To keep consistent with the naming of the Code attribute, I would probably call the keyword arguments prepend_text and append_text (even if it's a bit more verbose).

[ezpzbz]

Thanks @greschd. I just applied your suggestion and pushed the changes.

[greschd]

Looks good to me, just the docstring needs updating also. I'll leave it up to @ltalirz to merge this.

[codecov-io]

Codecov Report

Merging #3831 into develop will decrease coverage by 7.96%.
The diff coverage is 60%.

@@            Coverage Diff             @@
##           develop   #3831      +/-   ##
==========================================
- Coverage    77.16%   69.2%   -7.97%     
==========================================
  Files          458     458              
  Lines        33766   33770       +4     
==========================================
- Hits         26056   23369    -2687     
- Misses        7710   10401    +2691

Flag	Coverage Δ
#django	69.2% <60%> (-0.01%)	⬇️
#sqlalchemy	?

Impacted Files	Coverage Δ
aiida/manage/tests/pytest_fixtures.py	87.75% <60%> (-3.36%)	⬇️
...ions/versions/91b573400be5_prepare_schema_reset.py	0% <0%> (-100%)	⬇️
aiida/backends/sqlalchemy/utils.py	0% <0%> (-100%)	⬇️
...ns/5ddd24e52864_dbnode_type_to_dbnode_node_type.py	0% <0%> (-100%)	⬇️
...ions/d254fdfed416_rename_parameter_data_to_dict.py	0% <0%> (-100%)	⬇️
...ons/7ca08c391c49_calc_job_option_attribute_keys.py	0% <0%> (-100%)	⬇️
.../versions/ea2f50e7f615_dblog_create_uuid_column.py	0% <0%> (-100%)	⬇️
...emy/migrations/versions/e797afa09270_reset_hash.py	0% <0%> (-100%)	⬇️
...ations/versions/118349c10896_default_link_label.py	0% <0%> (-100%)	⬇️
...30c8430131_drop_node_columns_nodeversion_public.py	0% <0%> (-100%)	⬇️
... and 76 more

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[sphuber]

Good to go, thanks @pzarabadip 👍

Approved