Unit tests: add code coverage filtering

[lorjala]

Description

Running with regular expressions now works for code coverage filtering. In addition, headers removed automatically from the report. Use (--include-headers) flag to include headers.

Soft depends on #8153.

Pull request type

[ ] Fix
[ ] Refactor
[ ] Target update
[x] Functionality change
[ ] Breaking change

[lorjala]

FYI @OPpuolitaival @SeppoTakalo @AnttiKauppila

[cmonr]

LGTM, left a suggestion.

[cmonr]

Not sure if you want to add, but it might be a good idea to catch/indicate if an invalid coverage_type is provided.

[cmonr]

@lorjala What does

Soft depends on #8153.
mean?

Does it mean that #8153 should come in first, even though there's no hard order requirement?

[lorjala]

@cmonr #8153 should come in first, but they can be merged in any order.

[cmonr]

This needs a rebase. We'll start CI immediately after.

[lorjala]

@cmonr @0xc0170 trigger build

[OPpuolitaival]

This does not need any build.. current test builds are not testing anything inside UNITTEST folder. Discussed about this today with @0xc0170

[cmonr]

Will hold off on starting tests pending a discussion/alignment here: #8138 (comment)

I'd like to avoid what might seem like arbitrary CI skipping for PRs, and instead have something we could publicly point to when we do skip tests, so that we can easily clear up misunderstandings with users.

This also now needs a rebase.

[0xc0170]

Meanwhile, can we rebase and restart CI to move this forward?

[lorjala]

@0xc0170 rebased.

[0xc0170]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 3150
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/8154/

Triggering tests

/morph test
/morph export-build
/morph mbed2-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 2755
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/8154/

[mbed-ci]

Test : FAILURE

Build number : 2955
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/8154/2955

[cmonr]

/morph test

[mbed-ci]

Test : SUCCESS

Build number : 2964
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/8154/2964