CMake: Move ble fakes into FEATURE_BLE double dir ...

Previously ble fakes as part of UNITTESTS/fakes, this PR moves
ble fakes to FEATURE_BLE double directory to make ble stubs
to be self-contained.

CMake: fakes ble: Remove trailing whitespace

Remove mbed-headers-connectivity ...

Moved all the headers out of mbed-headers-connectivity, and these changes remove
that headers lib reference from lorawan and cellular unit tests

CMake: Create mbed-headers-ble library ...

Previously ble headers are part of mbed-headers-connectivity, this PR
moves ble headers into new mbed-headers-ble to make ble stubs to be
more self-contained and improves the composition of the library.

Merge pull request #14880 from Patater/dont-require-icetea ...

Dont require icetea

Merge pull request #14920 from hazzlim/refactor-connectivity-netsocket-unittests ...

Refactor connectivity netsocket unittests

Merge pull request #14924 from ARMmbed/refactor_cellular_unittest ...

Refactor cellular unittest CMake

Merge pull request #14927 from paul-szczepanek-arm/master ...

add workflow for checking ble feature selection compilation

Merge pull request #14922 from ARMmbed/at-handler-fix ...

Cellular: AT command fix - hex string shouldn't be quoted on bc95

Merge pull request #14921 from paul-szczepanek-arm/fix-ble-default-db ...

BLE: suppress error when no path is passed in for ble security db

Merge pull request #14919 from paul-szczepanek-arm/fix-feature-toggle ...

BLE: fix missing define guards for feature selection

Merge pull request #14909 from DDC-NDRS/ndrs-pst ...

SPIF: fixed _address_size to always initialize as 3_BYTES in ::init()

Merge pull request #14894 from hazzlim/refactor-connectivity-lorawan-unittests ...

Unit tests: Connectivity: Make lorawan test header dependencies explicit

Merge pull request #14821 from boraozgen/rtos-events-enable ...

RTOS: Add configuration to enable RTX events

Merge pull request #14805 from rkotan/I2C_Multiple_Buses_fix ...

i2c: fix issue #14735 with multiple buses

SPIF: Moving _address_size = SPIF_ADDR_SIZE_3_BYTES from constructors into ::init() instead

Unittests: Make netsocket test header dependencies explicit ...

The CMake target `mbed-headers` brings in all
headers, and we are gradually moving away from it and explicitly use
only headers needed by each unit test.

Unittests: Replace files with stubs in netsocket unit tests ...

Some netsocket unit tests depend on nanostack-libservice library, but
should use stubs instead of including the source files. We remove the
source files and link to mbed-stubs-nanostack-libservice.

Unittests: Clean up unused sources from netsocket ...

Some source files included when building netsocket unit tests with CMake
were determined to be unused by removing the files from target_sources()
and verifying that the tests still built and ran successfully. These
files have been removed from CMake builds.

Unittests: connectivity: remove trailing whitespace

run only on feature ble changes

run test on push instead of weekly

add workflow for checking ble feature selection compilation

icetea: Remove icetea TEST_APPS ...

icetea was intended to be deprecated in Mbed 6. icetea is no longer
maintained. Remove icetea-specific TEST_APPS and run_icetea tests from
Mbed OS.

CMake: Limit cellular device cmake to use mocks/sources what it depends ...

Update cellular device unit tests CMake depends on a mock, which is
required for the test instead of depending on the group of mbed-stubs,
mbed-headers, mbed_stub_headers, libraries.
Limit the cellular context unit test CMake target_sources to keep only
required sources

CMake: Limit cellular common unit tests to use mocks what it depends ...

Update cellular common unit tests CMake depends on a mock, which is
required for the test instead of depending on the group of
mbed-headers libraries.

CMake: Limit at cellular unittest to use mock what it depends ...

Update AT cellular unit tests CMake depends on a mock, which is required
for the test instead of depending on the group of mbed-stubs,
mbed-headers, mbed_stub_headers, libraries.

AT command fix - hex string shouldn't be quoted on bc95

suppress error when no path is passed in for ble sec db

Unit tests: Make lorawan test header dependencies explicit ...

To quote @LDong-Arm - "The CMake target `mbed-headers` brings in all
headers, and we are gradually moving away from it and explicitly use
only headers needed by each unit test."